ansible-playbooks/roles/common/tasks/smtp.yml

- name: Install postfix packages
  apt: pkg=postfix state=installed update_cache=yes
  when: ${with_postfix}

- name: Install mail aliases file
  template: src=aliases.j2 dest=/etc/aliases owner=root group=root mode=0644
  notify:
    - Regenerate aliases cache
  when: ${with_postfix} or ${with_mail_aliases}

- name: Install postfix main configuration
  template: src=postfix/main.cf.j2 dest=/etc/postfix/main.cf owner=root group=root mode=0644
  notify:
    - Restart postfix
  when: ${with_postfix}