Rename smtp hostname to smtp.data.coop.

roles/docker/tasks/services/postfix.yml

@@ -10,11 +10,10 @@
 - name: setup postfix docker container for outgoing mail
   docker_container:
     name: postfix
-    image: boky/postfix
-    restart_policy: unless-stopped
+    image: boky/postfix:v3.5.0
+    restart_policy: always
     networks:
       - name: postfix
     env:
       ALLOWED_SENDER_DOMAINS: "{{ postfix.allowed_sender_domains|join(' ') }}"
-      HOSTNAME: "mail.data.coop" # the name the smtp server will identify itself as
-
+      HOSTNAME: "smtp.data.coop" # the name the smtp server will identify itself as