ansible-msmtp-mailer/molecule/default/verify.yml

---
- name: Verify
  hosts: all

  tasks:
    - name: Check if msmtp is correctly listening on port 25
      wait_for:
        host: 0.0.0.0
        port: 25
        search_regex: 220 localhost ESMTP msmtpd
        timeout: 5