• In Gmail
    • Show original
    • Look for Authentication results header for dkim, spf, dmarc pass / fail status
  • Return-path email domain is used for dmarc spf alignment check
  • Dkim sig header is used for dmarc dkim alignment check
  • Only 1 of spf or dkim alignment needs to pass for dmarc to pass
  • mtasv.net is the mailer domain for postmark