SPF / DKIM / DMARC Checker

Check email authentication records for a domain. DKIM requires a selector (e.g. google, default, s1).

Don't know your DKIM selector? Check your ESP's setup docs — common ones include google, selector1, selector2, k1, mail.

What these records do

  • SPF — lists which servers are allowed to send email for your domain. Read the SPF syntax guide.
  • DKIM — cryptographically signs outgoing mail so receivers can verify it wasn't tampered with. See the DKIM guide.
  • DMARC — tells receivers what to do when SPF/DKIM checks fail, and where to send reports.
Getting SPF, DKIM, and DMARC right matters most when you're sending cold email or sales outreach at volume. MailPilot helps warm up mailboxes and keep an eye on deliverability once your records are in place.