proxmox: set mail relay

roles/proxmox/tasks/main.yml

@@ -57,6 +57,13 @@
              | sort | unique | join(";") }}'
   changed_when: false # maybe write a proper check if certificate requests are ever ansibled
 
+- name: Set SMTP relay
+  lineinfile:
+    path: /etc/postfix/main.cf
+    regexp: '^relayhost ='
+    line: 'relayhost = {{ mail_relay | default("") }}'
+  notify: reload postfix
+
 - include_tasks: firewall.yml
 
 - include_tasks: user.yml