This assumes you have installed Ansible, are familiar with the ansible-playbook command and have created a playbook.

The mail module can be used to send email. In this example, an email will be sent to john.doe@example.com.

---
- hosts: all
  tasks:
    - mail:
        host: smtp.example.com
        port: 587
        secure: starttls
        username: your_username
        password: your_password
        from: no-reply@example.com
        to: John Doe <john.doe@example.com>
        cc: Jane Doe <jane.doe@example.com>
        subject: Example Subject
        body: 'Example Message'
      delegate_to: localhost

If the email is successfully sent, the play should return the following.

PLAY [all]

TASK [Gathering Facts]
ok: [server1.example.com]

TASK [mail]
ok: [server1.example.com -> localhost]

PLAY RECAP
server1.example.com   : ok=2  changed=0  unreachable=0  failed=0