update..

roles/common/tasks/copy_files.yml

@@ -19,6 +19,24 @@
     - copy-files
     - copy-plain-files
 
+- name: (copy_files.yml) Copy plain files Postfix (/etc/postfix)
+  copy:
+    src: '{{ item.src_path }}'
+    dest: '{{ item.dest_path }}'
+    owner: root
+    group: root
+    mode: '0644'
+  loop: "{{ copy_plain_files_postfix }}"
+  loop_control:
+    label: 'dest: {{ item.name }}'
+  when: 
+    - inventory_hostname in groups['mail_server']
+    - copy_plain_files_postfix is defined
+    - copy_plain_files_postfix|length > 0
+  tags:
+    - copy-files
+    - copy-plain-files
+
 - name: (copy_files.yml) Copy plain files Postfix Firewall (postfwd)
   copy:
     src: '{{ item.src_path }}'