ansible-edda/plays/system/roles/mail/tasks/main.yml

- name: "configure mailname"
  ansible.builtin.template:
    src: "./mailname.j2"
    dest: "/etc/mailname"
    mode: 0644
  register: system_mail_mailname

- name: "configure mailutils"
  ansible.builtin.template:
    src: "./mailutils.conf.j2"
    dest: "/etc/mailutils.conf"
    mode: 0644

- name: "install postfix"
  ansible.builtin.apt:
    name:
      - "postfix"
      - "ca-certificates"
      - "libsasl2-modules"

- name: "configure aliases"
  ansible.builtin.template:
    src: "./aliases.j2"
    dest: "/etc/aliases"
    mode: 0644
  register: system_mail_aliases

- name: "update aliases"
  ansible.builtin.command:
    cmd: "newaliases"
  when:
    system_mail_aliases.changed

- name: "configure postfix"
  ansible.builtin.template:
    src: "./postfix/main.cf.j2"
    dest: "/etc/postfix/main.cf"
    mode: 0644
  register: system_mail_postfix_conf

- name: "configure credentials"
  ansible.builtin.template:
    src: "./postfix/sasl_passwd.j2"
    dest: "/etc/postfix/sasl_passwd"
    mode: 0600
  register: system_mail_postfix_credentials

- name: "create hash database"
  ansible.builtin.command:
    cmd: "postmap /etc/postfix/sasl_passwd"
  when:
    system_mail_postfix_credentials.changed

- name: "set hash database permissions"
  ansible.builtin.file:
    path: "/etc/postfix/sasl_passwd.db"
    mode: 0600

- name: "enable postfix"
  ansible.builtin.systemd:
    name: "postfix"
    enabled: true

- name: "start postfix"
  ansible.builtin.systemd:
    name: "postfix"
    state: "started"
  register: system_mail_postfix_start

- name: "restart postfix"
  ansible.builtin.systemd:
    name: "postfix"
    state: "restarted"
  when:
    (system_mail_mailname.changed or
    system_mail_aliases.changed or
    system_mail_postfix_conf.changed or
    system_mail_postfix_credentials.changed) and
    not system_mail_postfix_start.changed