---
- name: Install postfix
  apt:
    name: postfix
    update_cache: true
  register: result
  retries: 3
  until: result is succeeded

- name: Configure postfix
  template:
    src: main.cf.j2
    dest: /etc/postfix/main.cf
    mode: 0644
    owner: root
    group: root
  notify: restart postfix