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+# -*- coding: utf-8 -*-
+import json
+import unittest
+
+try:
+    from email.message import EmailMessage
+except ImportError:
+    # Python2
+    from email import message
+    EmailMessage = message.Message
+
+from sendgrid.helpers.mail import (
+    Asm, Attachment,
+    ClickTracking, Content,
+    DynamicTemplateData, Email, From,
+    Mail, Personalization,
+    Subject, Substitution, To, Cc, Bcc, TrackingSettings
+)
+
+# The below amp html email content is taken from [Google AMP Hello World Email](https://amp.dev/documentation/examples/introduction/hello_world_email/)
+amp_html_content = '''<!doctype html><html amp4email><head><meta charset="utf-8"><script async src="https://cdn.ampproject.org/v0.js"></script><style amp4email-boilerplate>body{visibility:hidden}</style><script async custom-element="amp-carousel" src="https://cdn.ampproject.org/v0/amp-carousel-0.1.js"></script><style amp-custom>.emailbody {padding: 16px;}.helloworld {font-family: Helvetica;color: red;font-size: 24px;padding-bottom: 8px;}.images {max-width: 100%;}</style></head><body><div class="emailbody"><h1 class="helloworld">Hello!</h1><amp-img src="https://amp.dev/static/samples/img/amp.jpg" width="800" height="600" layout="responsive"></amp-img></div></body></html>'''
+
+response_content_with_all_three_mime_contents = json.dumps({
+    "content": [
+        {
+            "type": "text/plain",
+            "value": "and easy to do anywhere, even with Python"
+        },
+        {
+            "type": "text/x-amp-html",
+            "value": amp_html_content
+        },
+        {
+            "type": "text/html",
+            "value": "<strong>and easy to do anywhere, even with Python</strong>"
+        }
+    ],
+    "from": {
+        "email": "test+from@example.com",
+        "name": "Example From Name"
+    },
+    "personalizations": [
+        {
+            "to": [
+                {
+                    "email": "test+to@example.com",
+                    "name": "Example To Name"
+                }
+            ]
+        }
+    ],
+    "subject": "Sending with SendGrid is Fun"
+})
+
+class UnitTests(unittest.TestCase):
+
+    def test_asm(self):
+        from sendgrid.helpers.mail import (GroupId, GroupsToDisplay)
+        asm1 = Asm(GroupId(1), GroupsToDisplay([1, 2, 3]))
+        asm2 = Asm(1, [1, 2, 3])
+        self.assertEqual(
+            asm1.group_id.get(), asm2.group_id.get())
+        self.assertEqual(
+            asm1.groups_to_display.get(), asm2.groups_to_display.get())
+
+    def test_attachment(self):
+        from sendgrid.helpers.mail import (FileContent, FileType, FileName,
+                                           Disposition, ContentId)
+        a1 = Attachment(
+            FileContent('Base64EncodedString'),
+            FileName('example.pdf'),
+            FileType('application/pdf'),
+            Disposition('attachment'),
+            ContentId('123')
+        )
+        a2 = Attachment(
+            'Base64EncodedString',
+            'example.pdf',
+            'application/pdf',
+            'attachment',
+            '123'
+        )
+        self.assertEqual(a1.file_content.get(), a2.file_content.get())
+        self.assertEqual(a1.file_name.get(), a2.file_name.get())
+        self.assertEqual(a1.file_type.get(), a2.file_type.get())
+        self.assertEqual(a1.disposition.get(), a2.disposition.get())
+        self.assertEqual(a1.content_id.get(), a2.content_id.get())
+
+    def test_batch_id(self):
+        from sendgrid.helpers.mail import BatchId
+
+        b1 = BatchId('1')
+        self.assertEqual('1', b1.get())
+
+    # Send a Single Email to a Single Recipient
+    def test_single_email_to_a_single_recipient(self):
+        from sendgrid.helpers.mail import (Mail, From, To, Subject,
+                                           PlainTextContent, HtmlContent)
+        self.maxDiff = None
+        message = Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=To('test+to@example.com', 'Example To Name'),
+            subject=Subject('Sending with SendGrid is Fun'),
+            plain_text_content=PlainTextContent(
+                'and easy to do anywhere, even with Python'),
+            html_content=HtmlContent(
+                '<strong>and easy to do anywhere, even with Python</strong>'))
+
+        self.assertEqual(
+            message.get(),
+            json.loads(r'''{
+                "content": [
+                    {
+                        "type": "text/plain",
+                        "value": "and easy to do anywhere, even with Python"
+                    },
+                    {
+                        "type": "text/html",
+                        "value": "<strong>and easy to do anywhere, even with Python</strong>"
+                    }
+                ],
+                "from": {
+                    "email": "test+from@example.com",
+                    "name": "Example From Name"
+                },
+                "personalizations": [
+                    {
+                        "to": [
+                            {
+                                "email": "test+to@example.com",
+                                "name": "Example To Name"
+                            }
+                        ]
+                    }
+                ],
+                "subject": "Sending with SendGrid is Fun"
+            }''')
+        )
+
+    def test_single_email_to_a_single_recipient_content_reversed(self):
+        """Tests bug found in Issue-451 with Content ordering causing a crash
+        """
+        from sendgrid.helpers.mail import (Mail, From, To, Subject,
+                                           PlainTextContent, HtmlContent)
+        self.maxDiff = None
+        message = Mail()
+        message.from_email = From('test+from@example.com', 'Example From Name')
+        message.to = To('test+to@example.com', 'Example To Name')
+        message.subject = Subject('Sending with SendGrid is Fun')
+        message.content = HtmlContent(
+            '<strong>and easy to do anywhere, even with Python</strong>')
+        message.content = PlainTextContent(
+            'and easy to do anywhere, even with Python')
+
+        self.assertEqual(
+            message.get(),
+            json.loads(r'''{
+                "content": [
+                    {
+                        "type": "text/plain",
+                        "value": "and easy to do anywhere, even with Python"
+                    },
+                    {
+                        "type": "text/html",
+                        "value": "<strong>and easy to do anywhere, even with Python</strong>"
+                    }
+                ],
+                "from": {
+                    "email": "test+from@example.com",
+                    "name": "Example From Name"
+                },
+                "personalizations": [
+                    {
+                        "to": [
+                            {
+                                "email": "test+to@example.com",
+                                "name": "Example To Name"
+                            }
+                        ]
+                    }
+                ],
+                "subject": "Sending with SendGrid is Fun"
+            }''')
+        )
+
+    def test_send_a_single_email_to_multiple_recipients(self):
+        from sendgrid.helpers.mail import (Mail, From, To, Subject,
+                                           PlainTextContent, HtmlContent)
+        self.maxDiff = None
+        to_emails = [
+            To('test+to0@example.com', 'Example To Name 0'),
+            To('test+to1@example.com', 'Example To Name 1')
+        ]
+        message = Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=to_emails,
+            subject=Subject('Sending with SendGrid is Fun'),
+            plain_text_content=PlainTextContent(
+                'and easy to do anywhere, even with Python'),
+            html_content=HtmlContent(
+                '<strong>and easy to do anywhere, even with Python</strong>'))
+
+        self.assertEqual(
+            message.get(),
+            json.loads(r'''{
+                "content": [
+                    {
+                        "type": "text/plain",
+                        "value": "and easy to do anywhere, even with Python"
+                    },
+                    {
+                        "type": "text/html",
+                        "value": "<strong>and easy to do anywhere, even with Python</strong>"
+                    }
+                ],
+                "from": {
+                    "email": "test+from@example.com",
+                    "name": "Example From Name"
+                },
+                "personalizations": [
+                    {
+                        "to": [
+                            {
+                                "email": "test+to0@example.com",
+                                "name": "Example To Name 0"
+                            },
+                            {
+                                "email": "test+to1@example.com",
+                                "name": "Example To Name 1"
+                            }
+                        ]
+                    }
+                ],
+                "subject": "Sending with SendGrid is Fun"
+            }''')
+        )
+
+    def test_send_a_single_email_with_multiple_reply_to_addresses(self):
+        from sendgrid.helpers.mail import (Mail, From, ReplyTo, To, Subject,
+                                           PlainTextContent, HtmlContent)
+        self.maxDiff = None
+        message = Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=To('test+to0@example.com', 'Example To Name'),
+            subject=Subject('Sending with SendGrid is Fun'),
+            plain_text_content=PlainTextContent('and easy to do anywhere, even with Python'),
+            html_content=HtmlContent('<strong>and easy to do anywhere, even with Python</strong>'))
+
+        message.reply_to_list = [ReplyTo(email = 'test+reply_to_1@example.com'), ReplyTo(email = 'test+reply_to_2@example.com')]
+
+        self.assertEqual(
+            message.get(),
+            json.loads(r'''{
+                "content": [
+                    {
+                        "type": "text/plain",
+                        "value": "and easy to do anywhere, even with Python"
+                    },
+                    {
+                        "type": "text/html",
+                        "value": "<strong>and easy to do anywhere, even with Python</strong>"
+                    }
+                ],
+                "from": {
+                    "email": "test+from@example.com",
+                    "name": "Example From Name"
+                },
+                "personalizations": [
+                    {
+                        "to": [
+                            {
+                                "email": "test+to0@example.com",
+                                "name": "Example To Name"
+                            }
+                        ]
+                    }
+                ],
+                "reply_to_list": [
+                    {
+                        "email": "test+reply_to_1@example.com"
+                    },
+                    {
+                        "email": "test+reply_to_2@example.com"
+                    }
+                ],
+                "subject": "Sending with SendGrid is Fun"
+            }''')
+        )
+
+    def test_multiple_emails_to_multiple_recipients(self):
+        from sendgrid.helpers.mail import (Mail, From, To, Subject,
+                                           PlainTextContent, HtmlContent,
+                                           Substitution)
+        self.maxDiff = None
+
+        to_emails = [
+            To(email='test+to0@example.com',
+               name='Example Name 0',
+               substitutions=[
+                   Substitution('-name-', 'Example Name Substitution 0'),
+                   Substitution('-github-', 'https://example.com/test0'),
+               ],
+               subject=Subject('Override Global Subject')),
+            To(email='test+to1@example.com',
+               name='Example Name 1',
+               substitutions=[
+                   Substitution('-name-', 'Example Name Substitution 1'),
+                   Substitution('-github-', 'https://example.com/test1'),
+               ])
+        ]
+        global_substitutions = Substitution('-time-', '2019-01-01 00:00:00')
+        message = Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=to_emails,
+            subject=Subject('Hi -name-'),
+            plain_text_content=PlainTextContent(
+                'Hello -name-, your URL is -github-, email sent at -time-'),
+            html_content=HtmlContent(
+                '<strong>Hello -name-, your URL is <a href=\"-github-\">here</a></strong> email sent at -time-'),
+            global_substitutions=global_substitutions,
+            is_multiple=True)
+
+        self.assertEqual(
+            message.get(),
+            json.loads(r'''{
+                "content": [
+                    {
+                        "type": "text/plain",
+                        "value": "Hello -name-, your URL is -github-, email sent at -time-"
+                    },
+                    {
+                        "type": "text/html",
+                        "value": "<strong>Hello -name-, your URL is <a href=\"-github-\">here</a></strong> email sent at -time-"
+                    }
+                ],
+                "from": {
+                    "email": "test+from@example.com",
+                    "name": "Example From Name"
+                },
+                "personalizations": [
+                    {
+                        "substitutions": {
+                            "-github-": "https://example.com/test1",
+                            "-name-": "Example Name Substitution 1",
+                            "-time-": "2019-01-01 00:00:00"
+                        },
+                        "to": [
+                            {
+                                "email": "test+to1@example.com",
+                                "name": "Example Name 1"
+                            }
+                        ]
+                    },
+                    {
+                        "subject": "Override Global Subject",
+                        "substitutions": {
+                            "-github-": "https://example.com/test0",
+                            "-name-": "Example Name Substitution 0",
+                            "-time-": "2019-01-01 00:00:00"
+                        },
+                        "to": [
+                            {
+                                "email": "test+to0@example.com",
+                                "name": "Example Name 0"
+                            }
+                        ]
+                    }
+                ],
+                "subject": "Hi -name-"
+            }''')
+        )
+
+    def test_single_email_with_all_three_email_contents_to_single_recipient(self):
+        from sendgrid.helpers.mail import (Mail, From, To, Subject,
+                                           PlainTextContent, HtmlContent, AmpHtmlContent)
+        self.maxDiff = None
+        message = Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=To('test+to@example.com', 'Example To Name'),
+            subject=Subject('Sending with SendGrid is Fun'),
+            plain_text_content=PlainTextContent(
+                'and easy to do anywhere, even with Python'),
+            amp_html_content=AmpHtmlContent(amp_html_content),
+            html_content=HtmlContent(
+                '<strong>and easy to do anywhere, even with Python</strong>')
+        )
+
+        self.assertEqual(
+            message.get(),
+            json.loads(response_content_with_all_three_mime_contents)
+        )
+
+    def test_single_email_with_amp_and_html_contents_to_single_recipient(self):
+        from sendgrid.helpers.mail import (Mail, From, To, Subject,
+                                           PlainTextContent, HtmlContent, AmpHtmlContent)
+        self.maxDiff = None
+        message = Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=To('test+to@example.com', 'Example To Name'),
+            subject=Subject('Sending with SendGrid is Fun'),
+            amp_html_content=AmpHtmlContent(amp_html_content),
+            html_content=HtmlContent(
+                '<strong>and easy to do anywhere, even with Python</strong>')
+        )
+
+        response_content = json.dumps({
+            "content": [
+                {
+                    "type": "text/x-amp-html",
+                    "value": amp_html_content
+                },
+                {
+                    "type": "text/html",
+                    "value": "<strong>and easy to do anywhere, even with Python</strong>"
+                }
+            ],
+            "from": {
+                "email": "test+from@example.com",
+                "name": "Example From Name"
+            },
+            "personalizations": [
+                {
+                    "to": [
+                        {
+                            "email": "test+to@example.com",
+                            "name": "Example To Name"
+                        }
+                    ]
+                }
+            ],
+            "subject": "Sending with SendGrid is Fun"
+        })
+        self.assertEqual(
+            message.get(),
+            json.loads(response_content)
+        )
+
+    def test_single_email_with_amp_and_plain_contents_to_single_recipient(self):
+        from sendgrid.helpers.mail import (Mail, From, To, Subject,
+                                           PlainTextContent, HtmlContent, AmpHtmlContent)
+        self.maxDiff = None
+        message = Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=To('test+to@example.com', 'Example To Name'),
+            subject=Subject('Sending with SendGrid is Fun'),
+            plain_text_content=PlainTextContent(
+                'and easy to do anywhere, even with Python'),
+            amp_html_content=AmpHtmlContent(amp_html_content)
+        )
+
+        response_content = json.dumps({
+            "content": [
+                {
+                    "type": "text/plain",
+                    "value": "and easy to do anywhere, even with Python"
+                },
+                {
+                    "type": "text/x-amp-html",
+                    "value": amp_html_content
+                }
+            ],
+            "from": {
+                "email": "test+from@example.com",
+                "name": "Example From Name"
+            },
+            "personalizations": [
+                {
+                    "to": [
+                        {
+                            "email": "test+to@example.com",
+                            "name": "Example To Name"
+                        }
+                    ]
+                }
+            ],
+            "subject": "Sending with SendGrid is Fun"
+        })
+        self.assertEqual(
+            message.get(),
+            json.loads(response_content)
+        )
+
+    ## Check ordering of MIME types in different variants - start
+    def test_single_email_with_all_three_contents_in_collapsed_order_of_plain_amp_html_content_single_recipient(self):
+        from sendgrid.helpers.mail import (Mail, From, To, Subject,
+                                           PlainTextContent, HtmlContent, AmpHtmlContent)
+        self.maxDiff = None
+        message = Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=To('test+to@example.com', 'Example To Name'),
+            subject=Subject('Sending with SendGrid is Fun')
+        )
+        message.content = PlainTextContent(
+            'and easy to do anywhere, even with Python')
+        message.content = AmpHtmlContent(amp_html_content)
+        message.content = HtmlContent(
+            '<strong>and easy to do anywhere, even with Python</strong>')
+
+        self.assertEqual(
+            message.get(),
+            json.loads(response_content_with_all_three_mime_contents)
+        )
+
+    def test_single_email_with_all_three_contents_in_collapsed_order_of_plain_html_amp_content_single_recipient(self):
+        from sendgrid.helpers.mail import (Mail, From, To, Subject,
+                                           PlainTextContent, HtmlContent, AmpHtmlContent)
+        self.maxDiff = None
+        message = Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=To('test+to@example.com', 'Example To Name'),
+            subject=Subject('Sending with SendGrid is Fun')
+        )
+        message.content = PlainTextContent(
+            'and easy to do anywhere, even with Python')
+        message.content = HtmlContent(
+            '<strong>and easy to do anywhere, even with Python</strong>')
+        message.content = AmpHtmlContent(amp_html_content)
+
+        self.assertEqual(
+            message.get(),
+            json.loads(response_content_with_all_three_mime_contents)
+        )
+
+    def test_single_email_with_all_three_contents_in_collapsed_order_of_html_plain_amp_content_single_recipient(self):
+        from sendgrid.helpers.mail import (Mail, From, To, Subject,
+                                           PlainTextContent, HtmlContent, AmpHtmlContent)
+        self.maxDiff = None
+        message = Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=To('test+to@example.com', 'Example To Name'),
+            subject=Subject('Sending with SendGrid is Fun')
+        )
+        message.content = HtmlContent(
+            '<strong>and easy to do anywhere, even with Python</strong>')
+        message.content = PlainTextContent(
+            'and easy to do anywhere, even with Python')
+        message.content = AmpHtmlContent(amp_html_content)
+
+        self.assertEqual(
+            message.get(),
+            json.loads(response_content_with_all_three_mime_contents)
+        )
+
+    def test_single_email_with_all_three_contents_in_collapsed_order_of_html_amp_plain_content_single_recipient(self):
+        from sendgrid.helpers.mail import (Mail, From, To, Subject,
+                                           PlainTextContent, HtmlContent, AmpHtmlContent)
+        self.maxDiff = None
+        message = Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=To('test+to@example.com', 'Example To Name'),
+            subject=Subject('Sending with SendGrid is Fun')
+        )
+        message.content = HtmlContent(
+            '<strong>and easy to do anywhere, even with Python</strong>')
+        message.content = AmpHtmlContent(amp_html_content)
+        message.content = PlainTextContent(
+            'and easy to do anywhere, even with Python')
+
+        self.assertEqual(
+            message.get(),
+            json.loads(response_content_with_all_three_mime_contents)
+        )
+
+    def test_single_email_with_all_three_contents_in_collapsed_order_of_amp_html_plain_content_single_recipient(self):
+        from sendgrid.helpers.mail import (Mail, From, To, Subject,
+                                           PlainTextContent, HtmlContent, AmpHtmlContent)
+        self.maxDiff = None
+        message = Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=To('test+to@example.com', 'Example To Name'),
+            subject=Subject('Sending with SendGrid is Fun')
+        )
+        message.content = AmpHtmlContent(amp_html_content)
+        message.content = HtmlContent(
+            '<strong>and easy to do anywhere, even with Python</strong>')
+        message.content = PlainTextContent(
+            'and easy to do anywhere, even with Python')
+
+        self.assertEqual(
+            message.get(),
+            json.loads(response_content_with_all_three_mime_contents)
+        )
+
+    def test_single_email_with_all_three_contents_in_collapsed_order_of_amp_plain_html_content_single_recipient(self):
+        from sendgrid.helpers.mail import (Mail, From, To, Subject,
+                                           PlainTextContent, HtmlContent, AmpHtmlContent)
+        self.maxDiff = None
+        message = Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=To('test+to@example.com', 'Example To Name'),
+            subject=Subject('Sending with SendGrid is Fun')
+        )
+        message.content = AmpHtmlContent(amp_html_content)
+        message.content = PlainTextContent(
+            'and easy to do anywhere, even with Python')
+        message.content = HtmlContent(
+            '<strong>and easy to do anywhere, even with Python</strong>')
+
+        self.assertEqual(
+            message.get(),
+            json.loads(response_content_with_all_three_mime_contents)
+        )
+
+    ## end
+
+    def test_value_error_is_raised_on_to_emails_set_to_list_of_lists(self):
+        from sendgrid.helpers.mail import (PlainTextContent, HtmlContent)
+        self.maxDiff = None
+        to_emails = [
+            ['test+to0@example.com', 'Example To Name 0'],
+            ['test+to1@example.com', 'Example To Name 1']
+        ]
+
+        with self.assertRaises(ValueError):
+            Mail(
+                from_email=From('test+from@example.com', 'Example From Name'),
+                to_emails=to_emails,
+                subject=Subject('Sending with SendGrid is Fun'),
+                plain_text_content=PlainTextContent(
+                    'and easy to do anywhere, even with Python'),
+                html_content=HtmlContent(
+                    '<strong>and easy to do anywhere, even with Python</strong>'))
+    
+    def test_value_error_is_raised_on_to_emails_set_to_reply_to_list_of_strs(self):
+        from sendgrid.helpers.mail import (PlainTextContent, HtmlContent)
+        self.maxDiff = None
+        to_emails = [
+            ('test+to0@example.com', 'Example To Name 0'),
+            ('test+to1@example.com', 'Example To Name 1')
+        ]
+    
+        mail = Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=to_emails,
+            subject=Subject('Sending with SendGrid is Fun'),
+            plain_text_content=PlainTextContent(
+                'and easy to do anywhere, even with Python'),
+            html_content=HtmlContent(
+                '<strong>and easy to do anywhere, even with Python</strong>'))
+        with self.assertRaises(ValueError):
+            mail.reply_to_list = ['test+reply_to0@example.com', 'test+reply_to1@example.com']
+    
+    def test_value_error_is_raised_on_to_emails_set_to_reply_to_list_of_tuples(self):
+        from sendgrid.helpers.mail import (PlainTextContent, HtmlContent)
+        self.maxDiff = None
+        to_emails = [
+            ('test+to0@example.com', 'Example To Name 0'),
+            ('test+to1@example.com', 'Example To Name 1')
+        ]
+    
+        mail = Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=to_emails,
+            subject=Subject('Sending with SendGrid is Fun'),
+            plain_text_content=PlainTextContent(
+                'and easy to do anywhere, even with Python'),
+            html_content=HtmlContent(
+                '<strong>and easy to do anywhere, even with Python</strong>'))
+        with self.assertRaises(ValueError):
+            mail.reply_to_list = [('test+reply_to@example.com', 'Test Name')]
+
+    def test_error_is_not_raised_on_to_emails_set_to_list_of_tuples(self):
+        from sendgrid.helpers.mail import (PlainTextContent, HtmlContent)
+        self.maxDiff = None
+        to_emails = [
+            ('test+to0@example.com', 'Example To Name 0'),
+            ('test+to1@example.com', 'Example To Name 1')
+        ]
+
+        Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=to_emails,
+            subject=Subject('Sending with SendGrid is Fun'),
+            plain_text_content=PlainTextContent(
+                'and easy to do anywhere, even with Python'),
+            html_content=HtmlContent(
+                '<strong>and easy to do anywhere, even with Python</strong>'))
+
+    def test_error_is_not_raised_on_to_emails_set_to_list_of_strs(self):
+        from sendgrid.helpers.mail import (PlainTextContent, HtmlContent)
+        self.maxDiff = None
+        to_emails = ['test+to0@example.com', 'test+to1@example.com']
+
+        Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=to_emails,
+            subject=Subject('Sending with SendGrid is Fun'),
+            plain_text_content=PlainTextContent(
+                'and easy to do anywhere, even with Python'),
+            html_content=HtmlContent(
+                '<strong>and easy to do anywhere, even with Python</strong>'))
+
+    def test_error_is_not_raised_on_to_emails_set_to_a_str(self):
+        from sendgrid.helpers.mail import (PlainTextContent, HtmlContent)
+        self.maxDiff = None
+        to_emails = 'test+to0@example.com'
+
+        Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=to_emails,
+            subject=Subject('Sending with SendGrid is Fun'),
+            plain_text_content=PlainTextContent(
+                'and easy to do anywhere, even with Python'),
+            html_content=HtmlContent(
+                '<strong>and easy to do anywhere, even with Python</strong>'))
+
+    def test_error_is_not_raised_on_to_emails_set_to_a_tuple(self):
+        from sendgrid.helpers.mail import (PlainTextContent, HtmlContent)
+        self.maxDiff = None
+        to_emails = ('test+to0@example.com', 'Example To Name 0')
+
+        Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=to_emails,
+            subject=Subject('Sending with SendGrid is Fun'),
+            plain_text_content=PlainTextContent(
+                'and easy to do anywhere, even with Python'),
+            html_content=HtmlContent(
+                '<strong>and easy to do anywhere, even with Python</strong>'))
+
+    def test_error_is_not_raised_on_to_emails_includes_bcc_cc(self):
+        from sendgrid.helpers.mail import (PlainTextContent, HtmlContent)
+        self.maxDiff = None
+        to_emails = [
+            To('test+to0@example.com', 'Example To Name 0'),
+            Bcc('test+bcc@example.com', 'Example Bcc Name 1'),
+            Cc('test+cc@example.com', 'Example Cc Name 2')
+        ]
+
+        Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=to_emails,
+            subject=Subject('Sending with SendGrid is Fun'),
+            plain_text_content=PlainTextContent(
+                'and easy to do anywhere, even with Python'),
+            html_content=HtmlContent(
+                '<strong>and easy to do anywhere, even with Python</strong>'))
+
+    def test_personalization_add_email_filters_out_duplicate_to_emails(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        to_email = To('test+to0@example.com', 'Example To Name 0')
+        p.add_email(to_email)
+        p.add_email(to_email)
+
+        self.assertEqual([to_email.get()], p.tos)
+
+    def test_personalization_add_email_filters_out_duplicate_to_emails_ignoring_case(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        to_email = To('test+to0@example.com', 'Example To Name 0')
+        to_email_with_caps = To('test+TO0@example.com', 'Example To Name 0')
+        p.add_email(to_email)
+        p.add_email(to_email_with_caps)
+
+        self.assertEqual([to_email.get()], p.tos)
+
+    def test_personalization_set_from_email(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        from_email = From('test+from@example.com', 'Example From')
+        p.set_from(from_email)
+
+        self.assertEqual(from_email.get(), p.from_email)
+
+    def test_personalization_filters_out_duplicate_cc_emails(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        cc_email = Cc('test+cc0@example.com', 'Example Cc Name 0')
+        p.add_email(cc_email)
+        p.add_email(cc_email)
+
+        self.assertEqual([cc_email.get()], p.ccs)
+
+    def test_personalization_filters_out_duplicate_cc_emails_ignoring_case(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        cc_email = Cc('test+cc0@example.com', 'Example Cc Name 0')
+        cc_email_with_caps = Cc('test+CC0@example.com', 'Example Cc Name 0')
+        p.add_email(cc_email)
+        p.add_email(cc_email_with_caps)
+
+        self.assertEqual([cc_email.get()], p.ccs)
+
+    def test_personalization_filters_out_duplicate_bcc_emails(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        bcc_email = Bcc('test+bcc0@example.com', 'Example Bcc Name 0')
+        p.add_email(bcc_email)
+        p.add_email(bcc_email)
+
+        self.assertEqual([bcc_email.get()], p.bccs)
+
+    def test_personalization_filters_out_duplicate_bcc_emails_ignoring_case(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        bcc_email = Bcc('test+bcc0@example.com', 'Example Bcc Name 0')
+        bcc_email_with_caps = Bcc('test+BCC0@example.com', 'Example Bcc Name 0')
+        p.add_email(bcc_email)
+        p.add_email(bcc_email_with_caps)
+
+        self.assertEqual([bcc_email.get()], p.bccs)
+
+    def test_personalization_tos_setter_filters_out_duplicate_dict_emails(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        to_emails = [{ 'email': 'test+to0@example.com', 'name': 'Example To Name 0' }] * 2
+        p.tos = to_emails
+
+        self.assertEqual([to_emails[0]], p.tos)
+
+    def test_personalization_tos_setter_filters_out_duplicate_dict_emails_ignoring_case(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        to_email = { 'email': 'test+to0@example.com', 'name': 'Example To Name 0' }
+        to_email_with_caps = { 'email': 'test+TO0@example.com', 'name': 'Example To Name 0' }
+        to_emails = [to_email, to_email_with_caps]
+        p.tos = to_emails
+
+        self.assertEqual([to_email], p.tos)
+
+    def test_personalization_tos_setter_filters_out_duplicate_to_emails(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        to_emails = [To('test+to0@example.com', 'Example To Name 0')] * 2
+        p.tos = to_emails
+
+        self.assertEqual([to_emails[0].get()], p.tos)
+
+
+    def test_personalization_tos_setter_filters_out_duplicate_to_emails_ignoring_case(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        to_email = To('test+to0@example.com', 'Example To Name 0')
+        to_email_with_caps = To('test+TO0@example.com', 'Example To Name 0')
+        to_emails = [to_email, to_email_with_caps]
+        p.tos = to_emails
+
+        self.assertEqual([to_email.get()], p.tos)
+
+    def test_personalization_ccs_setter_filters_out_duplicate_dict_emails(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        cc_emails = [{ 'email': 'test+cc0@example.com', 'name': 'Example Cc Name 0' }] * 2
+        p.ccs = cc_emails
+
+        self.assertEqual([cc_emails[0]], p.ccs)
+
+    def test_personalization_ccs_setter_filters_out_duplicate_dict_emails_ignoring_case(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        cc_email = { 'email': 'test+cc0@example.com', 'name': 'Example Cc Name 0' }
+        cc_email_with_caps = { 'email': 'test+CC0@example.com', 'name': 'Example Cc Name 0' }
+        cc_emails = [cc_email, cc_email_with_caps]
+        p.ccs = cc_emails
+
+        self.assertEqual([cc_email], p.ccs)
+
+    def test_personalization_ccs_setter_filters_out_duplicate_cc_emails(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        cc_emails = [Cc('test+cc0@example.com', 'Example Cc Name 0')] * 2
+        p.ccs = cc_emails
+
+        self.assertEqual([cc_emails[0].get()], p.ccs)
+
+    def test_personalization_ccs_setter_filters_out_duplicate_cc_emails_ignoring_case(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        cc_email = Cc('test+cc0@example.com', 'Example Cc Name 0')
+        cc_email_with_caps = Cc('test+CC0@example.com', 'Example Cc Name 0')
+        p.ccs = [cc_email, cc_email_with_caps]
+
+        self.assertEqual([cc_email.get()], p.ccs)
+
+    def test_personalization_bccs_setter_filters_out_duplicate_dict_emails(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        bcc_emails = [{ 'email': 'test+bcc0@example.com', 'name': 'Example Bcc Name 0' }] * 2
+        p.bccs = bcc_emails
+
+        self.assertEqual([bcc_emails[0]], p.bccs)
+
+    def test_personalization_bccs_setter_filters_out_duplicate_dict_emails_ignoring_case(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        bcc_email = { 'email': 'test+bcc0@example.com', 'name': 'Example Bcc Name 0' }
+        bcc_email_with_caps = { 'email': 'test+BCC0@example.com', 'name': 'Example Bcc Name 0' }
+        bcc_emails = [bcc_email, bcc_email_with_caps]
+        p.bccs = bcc_emails
+
+        self.assertEqual([bcc_email], p.bccs)
+
+    def test_personalization_bccs_setter_filters_out_duplicate_bcc_emails(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        bcc_emails = [Bcc('test+bcc0@example.com', 'Example Bcc Name 0')] * 2
+        p.bccs = bcc_emails
+
+        self.assertEqual([bcc_emails[0].get()], p.bccs)
+
+    def test_personalization_bccs_setter_filters_out_duplicate_bcc_emails_ignoring_case(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        bcc_email = Bcc('test+bcc0@example.com', 'Example Bcc Name 0')
+        bcc_email_with_caps = Bcc('test+BCC0@example.com', 'Example Bcc Name 0')
+        p.bccs = [bcc_email, bcc_email_with_caps]
+
+        self.assertEqual([bcc_email.get()], p.bccs)
+
+    def test_personalization_add_to_filters_out_duplicate_to_emails(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        to_email = To('test+to0@example.com', 'Example To Name 0')
+        p.add_to(to_email)
+        p.add_to(to_email)
+
+        expected = [to_email.get()]
+
+        self.assertEqual(expected, p.tos)
+
+    def test_personalization_add_bcc_filters_out_duplicate_bcc_emails(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        bcc_email = Bcc('test+to0@example.com', 'Example To Name 0')
+        p.add_bcc(bcc_email)
+        p.add_bcc(bcc_email)
+
+        expected = [bcc_email.get()]
+
+        self.assertEqual(expected, p.bccs)
+
+    def test_personalization_add_cc_filters_out_duplicate_cc_emails(self):
+        self.maxDiff = None
+
+        p = Personalization()
+        cc_email = Cc('test+to0@example.com', 'Example To Name 0')
+        p.add_cc(cc_email)
+        p.add_cc(cc_email)
+
+        expected = [cc_email.get()]
+
+        self.assertEqual(expected, p.ccs)
+
+    def test_dynamic_template_data(self):
+        self.maxDiff = None
+
+        to_emails = [
+            To(email='test+to+0@example.com',
+               name='Example To 0 Name',
+               dynamic_template_data=DynamicTemplateData({'name': 'Example 0 Name'})),
+            To(email='test+to+1@example.com',
+               name='Example To 1 Name',
+               dynamic_template_data={'name': 'Example 1 Name'})
+        ]
+        message = Mail(
+            from_email=From('test@example.com', 'Example From Name'),
+            to_emails=to_emails,
+            subject=Subject('Hi!'),
+            plain_text_content='Hello!',
+            html_content='<strong>Hello!</strong>',
+            is_multiple=True)
+
+        self.assertEqual(
+            message.get(),
+            json.loads(r'''{
+                "content": [
+                    {
+                        "type": "text/plain",
+                        "value": "Hello!"
+                    },
+                    {
+                        "type": "text/html",
+                        "value": "<strong>Hello!</strong>"
+                    }
+                ],
+                "from": {
+                    "email": "test@example.com",
+                    "name": "Example From Name"
+                },
+                "personalizations": [
+                    {
+                        "dynamic_template_data": {
+                            "name": "Example 1 Name"
+                        },
+                        "to": [
+                            {
+                                "email": "test+to+1@example.com",
+                                "name": "Example To 1 Name"
+                            }
+                        ]
+                    },
+                    {
+                        "dynamic_template_data": {
+                            "name": "Example 0 Name"
+                        },
+                        "to": [
+                            {
+                                "email": "test+to+0@example.com",
+                                "name": "Example To 0 Name"
+                            }
+                        ]
+                    }
+                ],
+                "subject": "Hi!"
+            }''')
+        )
+
+    def test_kitchen_sink(self):
+        from sendgrid.helpers.mail import (
+            Mail, From, To, Cc, Bcc, Subject, Substitution, Header,
+            CustomArg, SendAt, Content, MimeType, Attachment, FileName,
+            FileContent, FileType, Disposition, ContentId, TemplateId,
+            Section, ReplyTo, Category, BatchId, Asm, GroupId, GroupsToDisplay,
+            IpPoolName, MailSettings, BccSettings, BccSettingsEmail,
+            BypassBounceManagement, BypassListManagement, BypassSpamManagement,
+            BypassUnsubscribeManagement, FooterSettings, FooterText,
+            FooterHtml, SandBoxMode, SpamCheck, SpamThreshold, SpamUrl,
+            TrackingSettings, ClickTracking, SubscriptionTracking,
+            SubscriptionText, SubscriptionHtml, SubscriptionSubstitutionTag,
+            OpenTracking, OpenTrackingSubstitutionTag, Ganalytics,
+            UtmSource, UtmMedium, UtmTerm, UtmContent, UtmCampaign)
+
+        self.maxDiff = None
+
+        message = Mail()
+
+        # Define Personalizations
+
+        message.to = To('test1@example.com', 'Example User1', p=0)
+        message.to = [
+            To('test2@example.com', 'Example User2', p=0),
+            To('test3@example.com', 'Example User3', p=0)
+        ]
+
+        message.cc = Cc('test4@example.com', 'Example User4', p=0)
+        message.cc = [
+            Cc('test5@example.com', 'Example User5', p=0),
+            Cc('test6@example.com', 'Example User6', p=0)
+        ]
+
+        message.bcc = Bcc('test7@example.com', 'Example User7', p=0)
+        message.bcc = [
+            Bcc('test8@example.com', 'Example User8', p=0),
+            Bcc('test9@example.com', 'Example User9', p=0)
+        ]
+
+        message.subject = Subject('Sending with SendGrid is Fun 0', p=0)
+
+        message.header = Header('X-Test1', 'Test1', p=0)
+        message.header = Header('X-Test2', 'Test2', p=0)
+        message.header = [
+            Header('X-Test3', 'Test3', p=0),
+            Header('X-Test4', 'Test4', p=0)
+        ]
+
+        message.substitution = Substitution('%name1%', 'Example Name 1', p=0)
+        message.substitution = Substitution('%city1%', 'Example City 1', p=0)
+        message.substitution = [
+            Substitution('%name2%', 'Example Name 2', p=0),
+            Substitution('%city2%', 'Example City 2', p=0)
+        ]
+
+        message.custom_arg = CustomArg('marketing1', 'true', p=0)
+        message.custom_arg = CustomArg('transactional1', 'false', p=0)
+        message.custom_arg = [
+            CustomArg('marketing2', 'false', p=0),
+            CustomArg('transactional2', 'true', p=0)
+        ]
+
+        message.send_at = SendAt(1461775051, p=0)
+
+        message.to = To('test10@example.com', 'Example User10', p=1)
+        message.to = [
+            To('test11@example.com', 'Example User11', p=1),
+            To('test12@example.com', 'Example User12', p=1)
+        ]
+
+        message.cc = Cc('test13@example.com', 'Example User13', p=1)
+        message.cc = [
+            Cc('test14@example.com', 'Example User14', p=1),
+            Cc('test15@example.com', 'Example User15', p=1)
+        ]
+
+        message.bcc = Bcc('test16@example.com', 'Example User16', p=1)
+        message.bcc = [
+            Bcc('test17@example.com', 'Example User17', p=1),
+            Bcc('test18@example.com', 'Example User18', p=1)
+        ]
+
+        message.header = Header('X-Test5', 'Test5', p=1)
+        message.header = Header('X-Test6', 'Test6', p=1)
+        message.header = [
+            Header('X-Test7', 'Test7', p=1),
+            Header('X-Test8', 'Test8', p=1)
+        ]
+
+        message.substitution = Substitution('%name3%', 'Example Name 3', p=1)
+        message.substitution = Substitution('%city3%', 'Example City 3', p=1)
+        message.substitution = [
+            Substitution('%name4%', 'Example Name 4', p=1),
+            Substitution('%city4%', 'Example City 4', p=1)
+        ]
+
+        message.custom_arg = CustomArg('marketing3', 'true', p=1)
+        message.custom_arg = CustomArg('transactional3', 'false', p=1)
+        message.custom_arg = [
+            CustomArg('marketing4', 'false', p=1),
+            CustomArg('transactional4', 'true', p=1)
+        ]
+
+        message.send_at = SendAt(1461775052, p=1)
+
+        message.subject = Subject('Sending with SendGrid is Fun 1', p=1)
+
+        # The values below this comment are global to entire message
+
+        message.from_email = From('help@twilio.com', 'Twilio SendGrid')
+
+        message.reply_to = ReplyTo('help_reply@twilio.com', 'Twilio SendGrid Reply')
+
+        message.subject = Subject('Sending with SendGrid is Fun 2')
+
+        message.content = Content(
+            MimeType.text,
+            'and easy to do anywhere, even with Python')
+        message.content = Content(
+            MimeType.html,
+            '<strong>and easy to do anywhere, even with Python</strong>')
+        message.content = [
+            Content('text/calendar', 'Party Time!!'),
+            Content('text/custom', 'Party Time 2!!')
+        ]
+
+        message.attachment = Attachment(
+            FileContent('base64 encoded content 1'),
+            FileName('balance_001.pdf'),
+            FileType('application/pdf'),
+            Disposition('attachment'),
+            ContentId('Content ID 1'))
+        message.attachment = [
+            Attachment(
+                FileContent('base64 encoded content 2'),
+                FileName('banner.png'),
+                FileType('image/png'),
+                Disposition('inline'),
+                ContentId('Content ID 2')),
+            Attachment(
+                FileContent('base64 encoded content 3'),
+                FileName('banner2.png'),
+                FileType('image/png'),
+                Disposition('inline'),
+                ContentId('Content ID 3'))
+        ]
+
+        message.template_id = TemplateId(
+            '13b8f94f-bcae-4ec6-b752-70d6cb59f932')
+
+        message.section = Section(
+            '%section1%', 'Substitution for Section 1 Tag')
+        message.section = [
+            Section('%section2%', 'Substitution for Section 2 Tag'),
+            Section('%section3%', 'Substitution for Section 3 Tag')
+        ]
+
+        message.header = Header('X-Test9', 'Test9')
+        message.header = Header('X-Test10', 'Test10')
+        message.header = [
+            Header('X-Test11', 'Test11'),
+            Header('X-Test12', 'Test12')
+        ]
+
+        message.category = Category('Category 1')
+        message.category = Category('Category 2')
+        message.category = [
+            Category('Category 1'),
+            Category('Category 2')
+        ]
+
+        message.custom_arg = CustomArg('marketing5', 'false')
+        message.custom_arg = CustomArg('transactional5', 'true')
+        message.custom_arg = [
+            CustomArg('marketing6', 'true'),
+            CustomArg('transactional6', 'false')
+        ]
+
+        message.send_at = SendAt(1461775053)
+
+        message.batch_id = BatchId("HkJ5yLYULb7Rj8GKSx7u025ouWVlMgAi")
+
+        message.asm = Asm(GroupId(1), GroupsToDisplay([1, 2, 3, 4]))
+
+        message.ip_pool_name = IpPoolName("IP Pool Name")
+
+        mail_settings = MailSettings()
+        mail_settings.bcc_settings = BccSettings(
+            False, BccSettingsEmail("bcc@twilio.com"))
+        mail_settings.bypass_bounce_management = BypassBounceManagement(False)
+        mail_settings.bypass_list_management = BypassListManagement(False)
+        mail_settings.bypass_spam_management = BypassSpamManagement(False)
+        mail_settings.bypass_unsubscribe_management = BypassUnsubscribeManagement(False)
+        mail_settings.footer_settings = FooterSettings(
+            True, FooterText("w00t"), FooterHtml("<string>w00t!<strong>"))
+        mail_settings.sandbox_mode = SandBoxMode(True)
+        mail_settings.spam_check = SpamCheck(
+            True, SpamThreshold(5), SpamUrl("https://example.com"))
+        message.mail_settings = mail_settings
+
+        tracking_settings = TrackingSettings()
+        tracking_settings.click_tracking = ClickTracking(True, False)
+        tracking_settings.open_tracking = OpenTracking(
+            True, OpenTrackingSubstitutionTag("open_tracking"))
+        tracking_settings.subscription_tracking = SubscriptionTracking(
+            True,
+            SubscriptionText("Goodbye"),
+            SubscriptionHtml("<strong>Goodbye!</strong>"),
+            SubscriptionSubstitutionTag("unsubscribe"))
+        tracking_settings.ganalytics = Ganalytics(
+            True,
+            UtmSource("utm_source"),
+            UtmMedium("utm_medium"),
+            UtmTerm("utm_term"),
+            UtmContent("utm_content"),
+            UtmCampaign("utm_campaign"))
+        message.tracking_settings = tracking_settings
+        self.assertEqual(
+            message.get(),
+            json.loads(r'''{
+                "asm": {
+                    "group_id": 1,
+                    "groups_to_display": [
+                        1,
+                        2,
+                        3,
+                        4
+                    ]
+                },
+                "attachments": [
+                    {
+                        "content": "base64 encoded content 3",
+                        "content_id": "Content ID 3",
+                        "disposition": "inline",
+                        "filename": "banner2.png",
+                        "type": "image/png"
+                    },
+                    {
+                        "content": "base64 encoded content 2",
+                        "content_id": "Content ID 2",
+                        "disposition": "inline",
+                        "filename": "banner.png",
+                        "type": "image/png"
+                    },
+                    {
+                        "content": "base64 encoded content 1",
+                        "content_id": "Content ID 1",
+                        "disposition": "attachment",
+                        "filename": "balance_001.pdf",
+                        "type": "application/pdf"
+                    }
+                ],
+                "batch_id": "HkJ5yLYULb7Rj8GKSx7u025ouWVlMgAi",
+                "categories": [
+                    "Category 2",
+                    "Category 1",
+                    "Category 2",
+                    "Category 1"
+                ],
+                "content": [
+                    {
+                        "type": "text/plain",
+                        "value": "and easy to do anywhere, even with Python"
+                    },
+                    {
+                        "type": "text/html",
+                        "value": "<strong>and easy to do anywhere, even with Python</strong>"
+                    },
+                    {
+                        "type": "text/calendar",
+                        "value": "Party Time!!"
+                    },
+                    {
+                        "type": "text/custom",
+                        "value": "Party Time 2!!"
+                    }
+                ],
+                "custom_args": {
+                    "marketing5": "false",
+                    "marketing6": "true",
+                    "transactional5": "true",
+                    "transactional6": "false"
+                },
+                "from": {
+                    "email": "help@twilio.com",
+                    "name": "Twilio SendGrid"
+                },
+                "headers": {
+                    "X-Test10": "Test10",
+                    "X-Test11": "Test11",
+                    "X-Test12": "Test12",
+                    "X-Test9": "Test9"
+                },
+                "ip_pool_name": "IP Pool Name",
+                "mail_settings": {
+                    "bcc": {
+                        "email": "bcc@twilio.com",
+                        "enable": false
+                    },
+                    "bypass_bounce_management": {
+                        "enable": false
+                    },
+                    "bypass_list_management": {
+                        "enable": false
+                    },
+                    "bypass_spam_management": {
+                        "enable": false
+                    },
+                    "bypass_unsubscribe_management": {
+                        "enable": false
+                    },
+                    "footer": {
+                        "enable": true,
+                        "html": "<string>w00t!<strong>",
+                        "text": "w00t"
+                    },
+                    "sandbox_mode": {
+                        "enable": true
+                    },
+                    "spam_check": {
+                        "enable": true,
+                        "post_to_url": "https://example.com",
+                        "threshold": 5
+                    }
+                },
+                "personalizations": [
+                    {
+                        "bcc": [
+                            {
+                                "email": "test7@example.com",
+                                "name": "Example User7"
+                            },
+                            {
+                                "email": "test8@example.com",
+                                "name": "Example User8"
+                            },
+                            {
+                                "email": "test9@example.com",
+                                "name": "Example User9"
+                            }
+                        ],
+                        "cc": [
+                            {
+                                "email": "test4@example.com",
+                                "name": "Example User4"
+                            },
+                            {
+                                "email": "test5@example.com",
+                                "name": "Example User5"
+                            },
+                            {
+                                "email": "test6@example.com",
+                                "name": "Example User6"
+                            }
+                        ],
+                        "custom_args": {
+                            "marketing1": "true",
+                            "marketing2": "false",
+                            "transactional1": "false",
+                            "transactional2": "true"
+                        },
+                        "headers": {
+                            "X-Test1": "Test1",
+                            "X-Test2": "Test2",
+                            "X-Test3": "Test3",
+                            "X-Test4": "Test4"
+                        },
+                        "send_at": 1461775051,
+                        "subject": "Sending with SendGrid is Fun 0",
+                        "substitutions": {
+                            "%city1%": "Example City 1",
+                            "%city2%": "Example City 2",
+                            "%name1%": "Example Name 1",
+                            "%name2%": "Example Name 2"
+                        },
+                        "to": [
+                            {
+                                "email": "test1@example.com",
+                                "name": "Example User1"
+                            },
+                            {
+                                "email": "test2@example.com",
+                                "name": "Example User2"
+                            },
+                            {
+                                "email": "test3@example.com",
+                                "name": "Example User3"
+                            }
+                        ]
+                    },
+                    {
+                        "bcc": [
+                            {
+                                "email": "test16@example.com",
+                                "name": "Example User16"
+                            },
+                            {
+                                "email": "test17@example.com",
+                                "name": "Example User17"
+                            },
+                            {
+                                "email": "test18@example.com",
+                                "name": "Example User18"
+                            }
+                        ],
+                        "cc": [
+                            {
+                                "email": "test13@example.com",
+                                "name": "Example User13"
+                            },
+                            {
+                                "email": "test14@example.com",
+                                "name": "Example User14"
+                            },
+                            {
+                                "email": "test15@example.com",
+                                "name": "Example User15"
+                            }
+                        ],
+                        "custom_args": {
+                            "marketing3": "true",
+                            "marketing4": "false",
+                            "transactional3": "false",
+                            "transactional4": "true"
+                        },
+                        "headers": {
+                            "X-Test5": "Test5",
+                            "X-Test6": "Test6",
+                            "X-Test7": "Test7",
+                            "X-Test8": "Test8"
+                        },
+                        "send_at": 1461775052,
+                        "subject": "Sending with SendGrid is Fun 1",
+                        "substitutions": {
+                            "%city3%": "Example City 3",
+                            "%city4%": "Example City 4",
+                            "%name3%": "Example Name 3",
+                            "%name4%": "Example Name 4"
+                        },
+                        "to": [
+                            {
+                                "email": "test10@example.com",
+                                "name": "Example User10"
+                            },
+                            {
+                                "email": "test11@example.com",
+                                "name": "Example User11"
+                            },
+                            {
+                                "email": "test12@example.com",
+                                "name": "Example User12"
+                            }
+                        ]
+                    }
+                ],
+                "reply_to": {
+                    "email": "help_reply@twilio.com",
+                    "name": "Twilio SendGrid Reply"
+                },
+                "sections": {
+                    "%section1%": "Substitution for Section 1 Tag",
+                    "%section2%": "Substitution for Section 2 Tag",
+                    "%section3%": "Substitution for Section 3 Tag"
+                },
+                "send_at": 1461775053,
+                "subject": "Sending with SendGrid is Fun 2",
+                "template_id": "13b8f94f-bcae-4ec6-b752-70d6cb59f932",
+                "tracking_settings": {
+                    "click_tracking": {
+                        "enable": true,
+                        "enable_text": false
+                    },
+                    "ganalytics": {
+                        "enable": true,
+                        "utm_campaign": "utm_campaign",
+                        "utm_content": "utm_content",
+                        "utm_medium": "utm_medium",
+                        "utm_source": "utm_source",
+                        "utm_term": "utm_term"
+                    },
+                    "open_tracking": {
+                        "enable": true,
+                        "substitution_tag": "open_tracking"
+                    },
+                    "subscription_tracking": {
+                        "enable": true,
+                        "html": "<strong>Goodbye!</strong>",
+                        "substitution_tag": "unsubscribe",
+                        "text": "Goodbye"
+                    }
+                }
+            }''')
+        )
+
+    # Send a Single Email to a Single Recipient with a Dynamic Template
+    def test_single_email_to_a_single_recipient_with_dynamic_templates(self):
+        from sendgrid.helpers.mail import (Mail, From, To, Subject,
+                                           PlainTextContent, HtmlContent)
+        self.maxDiff = None
+        message = Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=To('test+to@example.com', 'Example To Name'),
+            subject=Subject('Sending with SendGrid is Fun'),
+            plain_text_content=PlainTextContent(
+                'and easy to do anywhere, even with Python'),
+            html_content=HtmlContent(
+                '<strong>and easy to do anywhere, even with Python</strong>'))
+        message.dynamic_template_data = DynamicTemplateData({
+            "total": "$ 239.85",
+            "items": [
+                {
+                    "text": "New Line Sneakers",
+                    "image": "https://marketing-image-production.s3.amazonaws.com/uploads/8dda1131320a6d978b515cc04ed479df259a458d5d45d58b6b381cae0bf9588113e80ef912f69e8c4cc1ef1a0297e8eefdb7b270064cc046b79a44e21b811802.png",
+                    "price": "$ 79.95"
+                },
+                {
+                    "text": "Old Line Sneakers",
+                    "image": "https://marketing-image-production.s3.amazonaws.com/uploads/3629f54390ead663d4eb7c53702e492de63299d7c5f7239efdc693b09b9b28c82c924225dcd8dcb65732d5ca7b7b753c5f17e056405bbd4596e4e63a96ae5018.png",
+                    "price": "$ 79.95"
+                },
+                {
+                    "text": "Blue Line Sneakers",
+                    "image": "https://marketing-image-production.s3.amazonaws.com/uploads/00731ed18eff0ad5da890d876c456c3124a4e44cb48196533e9b95fb2b959b7194c2dc7637b788341d1ff4f88d1dc88e23f7e3704726d313c57f350911dd2bd0.png",
+                    "price": "$ 79.95"
+                }
+            ],
+            "receipt": True,
+            "name": "Sample Name",
+            "address01": "1234 Fake St.",
+            "address02": "Apt. 123",
+            "city": "Place",
+            "state": "CO",
+            "zip": "80202"
+        })
+        self.assertEqual(
+            message.get(),
+            json.loads(r'''{
+                "content": [
+                    {
+                        "type": "text/plain",
+                        "value": "and easy to do anywhere, even with Python"
+                    },
+                    {
+                        "type": "text/html",
+                        "value": "<strong>and easy to do anywhere, even with Python</strong>"
+                    }
+                ],
+                "from": {
+                    "email": "test+from@example.com",
+                    "name": "Example From Name"
+                },
+                "personalizations": [
+                    {
+                        "dynamic_template_data": {
+                            "address01": "1234 Fake St.",
+                            "address02": "Apt. 123",
+                            "city": "Place",
+                            "items": [
+                                {
+                                    "image": "https://marketing-image-production.s3.amazonaws.com/uploads/8dda1131320a6d978b515cc04ed479df259a458d5d45d58b6b381cae0bf9588113e80ef912f69e8c4cc1ef1a0297e8eefdb7b270064cc046b79a44e21b811802.png",
+                                    "price": "$ 79.95",
+                                    "text": "New Line Sneakers"
+                                },
+                                {
+                                    "image": "https://marketing-image-production.s3.amazonaws.com/uploads/3629f54390ead663d4eb7c53702e492de63299d7c5f7239efdc693b09b9b28c82c924225dcd8dcb65732d5ca7b7b753c5f17e056405bbd4596e4e63a96ae5018.png",
+                                    "price": "$ 79.95",
+                                    "text": "Old Line Sneakers"
+                                },
+                                {
+                                    "image": "https://marketing-image-production.s3.amazonaws.com/uploads/00731ed18eff0ad5da890d876c456c3124a4e44cb48196533e9b95fb2b959b7194c2dc7637b788341d1ff4f88d1dc88e23f7e3704726d313c57f350911dd2bd0.png",
+                                    "price": "$ 79.95",
+                                    "text": "Blue Line Sneakers"
+                                }
+                            ],
+                            "name": "Sample Name",
+                            "receipt": true,
+                            "state": "CO",
+                            "total": "$ 239.85",
+                            "zip": "80202"
+                        },
+                        "to": [
+                            {
+                                "email": "test+to@example.com",
+                                "name": "Example To Name"
+                            }
+                        ]
+                    }
+                ],
+                "subject": "Sending with SendGrid is Fun"
+            }''')
+        )
+
+    def test_sendgrid_api_key(self):
+        """Tests if including SendGrid API will throw an Exception"""
+
+        # Minimum required to send an email
+        self.max_diff = None
+        mail = Mail()
+
+        mail.from_email = Email("test@example.com")
+
+        mail.subject = "Hello World from the SendGrid Python Library"
+
+        personalization = Personalization()
+        personalization.add_to(Email("test@example.com"))
+        mail.add_personalization(personalization)
+
+        # Try to include SendGrid API key
+        try:
+            mail.add_content(
+                Content(
+                    "text/plain",
+                    "some SG.2123b1B.1212lBaC here"))
+            mail.add_content(
+                Content(
+                    "text/html",
+                    "<html><body>some SG.Ba2BlJSDba.232Ln2 here</body></html>"))
+
+            self.assertEqual(
+                json.dumps(
+                    mail.get(),
+                    sort_keys=True),
+                '{"content": [{"type": "text/plain", "value": "some text here"}, '
+                '{"type": "text/html", '
+                '"value": "<html><body>some text here</body></html>"}], '
+                '"from": {"email": "test@example.com"}, "personalizations": '
+                '[{"to": [{"email": "test@example.com"}]}], '
+                '"subject": "Hello World from the SendGrid Python Library"}'
+            )
+
+        # Exception should be thrown
+        except Exception:
+            pass
+
+        # Exception not thrown
+        else:
+            self.fail("Should have failed as SendGrid API key included")
+
+    def test_unicode_values_in_substitutions_helper(self):
+        from sendgrid.helpers.mail import (Mail, From, To, Subject,
+                                           PlainTextContent, HtmlContent)
+        self.maxDiff = None
+        message = Mail(
+            from_email=From('test+from@example.com', 'Example From Name'),
+            to_emails=To('test+to@example.com', 'Example To Name'),
+            subject=Subject('Sending with SendGrid is Fun'),
+            plain_text_content=PlainTextContent(
+                'and easy to do anywhere, even with Python'),
+            html_content=HtmlContent(
+                '<strong>and easy to do anywhere, even with Python</strong>'))
+        message.substitution = Substitution('%city%', u'Αθήνα', p=1)
+        self.assertEqual(
+            message.get(),
+            json.loads(r'''{
+                "content": [
+                    {
+                        "type": "text/plain",
+                        "value": "and easy to do anywhere, even with Python"
+                    },
+                    {
+                        "type": "text/html",
+                        "value": "<strong>and easy to do anywhere, even with Python</strong>"
+                    }
+                ],
+                "from": {
+                    "email": "test+from@example.com",
+                    "name": "Example From Name"
+                },
+                "personalizations": [
+                    {
+                        "to": [
+                            {
+                                "email": "test+to@example.com",
+                                "name": "Example To Name"
+                            }
+                        ]
+                    },
+                    {
+                        "substitutions": {
+                            "%city%": "Αθήνα"
+                        }
+                    }
+                ],
+                "subject": "Sending with SendGrid is Fun"
+            }''')
+        )
+
+    def test_asm_display_group_limit(self):
+        self.assertRaises(ValueError, Asm, 1, list(range(26)))
+
+    def test_disable_tracking(self):
+        tracking_settings = TrackingSettings()
+        tracking_settings.click_tracking = ClickTracking(False, False)
+
+        self.assertEqual(
+            tracking_settings.get(),
+            {'click_tracking': {'enable': False, 'enable_text': False}}
+        )
+
+    def test_bypass_list_management(self):
+        from sendgrid.helpers.mail import (MailSettings, BypassListManagement)
+        mail_settings = MailSettings()
+        mail_settings.bypass_list_management = BypassListManagement(True)
+
+        self.assertEqual(
+            mail_settings.get(),
+            {
+                "bypass_list_management": {
+                    "enable": True
+                },
+            },
+        )
+
+    def test_v3_bypass_filters(self):
+        from sendgrid.helpers.mail import (
+            MailSettings, BypassBounceManagement,
+            BypassSpamManagement, BypassUnsubscribeManagement
+        )
+        mail_settings = MailSettings()
+        mail_settings.bypass_bounce_management = BypassBounceManagement(True)
+        mail_settings.bypass_spam_management = BypassSpamManagement(True)
+        mail_settings.bypass_unsubscribe_management = BypassUnsubscribeManagement(True)
+
+        self.assertEqual(
+            mail_settings.get(),
+            {
+                "bypass_bounce_management": {
+                    "enable": True
+                },
+                "bypass_spam_management": {
+                    "enable": True
+                },
+                "bypass_unsubscribe_management": {
+                    "enable": True
+                },
+            },
+        )