computer-playbook/roles/sys-postfix/tasks/main.yml

- block:
  - name: Include dependency 'user-administrator'
    include_role:
      name: user-administrator
    when: run_once_user_administrator is not defined
  - include_tasks: utils/run_once.yml
  when: run_once_sys_postfix is not defined

- name: install postfix
  community.general.pacman:
    name: postfix
    state: present