Email authentication guides

Fixes for email authentication errors, setup for each email provider and DNS host, and how SPF, DKIM and DMARC work.

Email errors

What an email authentication error or warning means, and how to fix it with your provider.

  • DMARC fail: what it means and how to fix it

    What dmarc=fail means, how to read it in the Authentication-Results header, and how to fix SPF and DKIM alignment for services and forwarded mail.

    Updated

  • DMARC policy not enabled

    What the DMARC policy not enabled warning means, whether p=none affects delivery, and the safe order to move to quarantine or reject.

    Updated

  • No DMARC record found

    Fix No DMARC record found: add the right DNS TXT record, check subdomain inheritance, and troubleshoot a record that still does not appear.

    Updated