https://support.google.com/mail/answer/81126?hl=en
- setup
- check
- monitor
- setup
- check
- monitor
Specs: https://datatracker.ietf.org/doc/draft-kucherawy-dmarc-base/?include_text=1
- setup https://unlocktheinbox.com/dmarcwizard/
- check mailto:mailtest@unlocktheinbox.com
- monitor
host -t TXT <domain>
- List-Unsubscribe:
- Precedence: bulk
- Return-Path:, Reply-to:, From:, To:, Subject:
- SMTP "MAIL FORM: from@addre.ss"
- online version
- who (email address) is subscribed
- contact
- unsubscribe link
- HTML and plain payload