postfix: Add relay support to specific domains

roles/postfix/tasks/relay.yml

@@ -0,0 +1,14 @@
+---
+- name: listen to all interfaces
+  lineinfile:
+    path: /etc/postfix/main.cf
+    state: absent
+    regexp: "^#?inet_interfaces = .*"
+  notify: restart postfix
+
+- name: add relayed domains
+  lineinfile:
+    path: /etc/postfix/main.cf
+    regexp: "^#?relay_domains = .*"
+    line: "relay_domains = $mydestination, {{ relay_domains|join(',') }}"
+  notify: restart postfix