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diff --git a/gn/services/mailman-container.scm b/gn/services/mailman-container.scm
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+(define-module (gn services mailman-container))
+
+(use-modules (gnu)
+             (gn packages mailman)
+             (guix records)
+             (ice-9 match))
+(use-service-modules base mcron networking shepherd)
+
+(define-record-type* <mailman-configuration>
+  mailman-configuration
+  make-mailman-configuration
+  mailman-configuration?
+  (package          mailman-configuration-package     ; package
+                    (default mailman))
+  )
+
+(define mailman-cronjobs
+  (match-lambda
+    (($ <mailman-configuration> package)
+     (list
+       #~(job '(next-hour '(0))
+              (string-append #$package "/bin/mailman digests --periodic"))
+       #~(job '(next-hour '(8))
+              (string-append #$package "/bin/mailman notify"))))))
+
+(define mailman-activation
+  (match-lambda
+    (($ <mailman-configuration> package)
+     #~(begin
+         (use-modules (guix build utils))
+         (let ((%user (getpwnam "mailman")))
+           ;; Prepare the environment for mailman:
+           ;; https://docs.mailman.io/en-us/install-from-binary/
+           (unless (directory-exists? #$work-dir)
+             (mkdir-p #$work-dir)
+             ;; These two are supposed to be recursive.
+             (chown #$work-dir (passwd:uid %user) (passwd:gid %user))
+             (chmod #$work-dir #o750)))))))
+
+(define mailman-config-file
+  (plain-file "mailman.cfg"
+              "[mailman]
+layout: local
+\n"))
+
+(define mailman-shepherd-service
+  (match-lambda
+    (($ <mailman-configuration> package)
+     (list (shepherd-service
+             (documentation "Run the Mailman server.")
+             (requirement '(networking))
+             (provision '(mailman))
+             (start #~(make-forkexec-constructor
+                        (list
+                          #$(file-append package "/bin/mailman")
+                          "start")
+                        #:environment-variables
+                        (list (string-append "MAILMAN_CONFIG_FILE" mailman-config-file)
+                        )
+                        ))
+             (stop #~(make-kill-destructor
+                       (list
+                         #$(file-append package "/bin/mailman")
+                         "stop"))))))))
+
+(define mailman-service-type
+  (service-type
+    (name 'mailman)
+    (extensions
+      (list (service-extension shepherd-root-service-type
+                               mailman-shepherd-service)
+            (service-extension activation-service-type
+                               mailman-activation)
+            (service-extension mcron-service-type
+                               mailman-cronjobs)))
+    (description
+     "Run a Mailman server.")
+    (default-value (mailman-configuration))))
+
+
+(operating-system
+  (host-name "mailman")
+  (timezone "Etc/UTC")
+  (locale "en_US.utf8")
+
+  (bootloader (bootloader-configuration
+               (bootloader grub-bootloader)
+               (target "does-not-matter")))
+  (file-systems %base-file-systems)
+  ;; No firmware for VMs or containers.
+  (firmware '())
+
+  (services (list (service dhcp-client-service-type)
+                  (service mailman-service-type))))