postfix: add rt4mailgate support

postfix/defaults/main.yml

@@ -26,3 +26,8 @@ postfix_network_access:
   - cidr: 134.130.5.32/27  # rwth
     action: permit
 postfix_content_filter: false  # or: spamassassin
+
+postfix_aliases_rt: []
+#  - queue: IT
+#    url: https://rt.example.com
+#    address: it

postfix/tasks/main.yml

@@ -78,6 +78,15 @@
     - postfix
     - mail
 
+- name: install rt-mailgate if needed
+  apt:
+    name: rt4-clients
+    state: present
+  when: postfix_aliases_rt|bool
+  tags:
+    - postfix
+    - mail
+
 - name: ensure system alias database is present
   template:
     src: aliases.j2

postfix/templates/aliases.j2

 {% for alias in system_aliases %}
 {{ alias.src }}: {{ alias.dest }}
 {% endfor %}
+{% for alias in postfix_aliases_rt|default([]) %}
+{{ alias.address|default(alias.queue|lower) }}: "|/usr/bin/rt-mailgate --queue {{ alias.queue }} --action correspond --url {{ alias.url }}"
+{{ alias.address|default(alias.queue|lower) }}-comment: "|/usr/bin/rt-mailgate --queue {{ alias.queue }} --action comment --url {{ alias.url }}"
+{% endfor %}