clone from private repo

mail_system/tasks/remove_other_mtas.yml

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+- name: find all installed versions of mail-transport-agent except postfix
+  shell: aptitude search '~i~Pmail-transport-agent' | sed -e 's/^...\(.*\)/\1/' | awk '{ print $1 }' | grep -v postfix || /bin/true
+  register: mtas
+
+- name: purge MTAs other than postfix
+  apt:
+    name: "{{ item }}"
+    state: absent
+    purge: yes
+  loop: "{{ mtas.stdout_lines|list }}"