ansible-ops-management/init-rocky-postfix-relay.yml

---
# Configures postfix on a system to relay mail
# NOTE: smtp vars will be in vaults - originally they were available directly
#       on the ansible host. This was never a viable and secure option.
- name: Configure Postfix Relay
  hosts: all
  become: true

  handlers:
    - import_tasks: handlers/main.yml

  pre_tasks:
    - name: Check if ansible cannot be run here
      stat:
        path: /etc/no-ansible
      register: no_ansible

    - name: Verify if we can run ansible
      ansible.builtin.assert:
        that:
          - "not no_ansible.stat.exists"
        success_msg: "We are not able to run on this node"
        fail_msg: "/etc/no-ansible exists - skipping run on this node"

  tasks:
    - name: Deploy Postfix Relay
      import_tasks: tasks/postfix_relay.yml

  post_tasks:
    - name: Touching run file that ansible has ran here
      ansible.builtin.file:
        path: /var/log/ansible.run
        state: touch
        mode: '0644'
        owner: root
        group: root
...