Free tool
Email authentication checker.
Look up a domain's SPF, DKIM, DMARC, and BIMI readiness in one pass. See the evidence, what passes, and what to fix.
Three records prove your mail is yours.
01
SPF
SPF lists the servers allowed to send mail for your domain. A receiver checks the sending server against that list and flags mail that comes from anywhere else.
02
DKIM
DKIM signs each email with a private key. The receiver fetches the matching public key from your DNS and confirms the email arrived unaltered.
03
DMARC
DMARC ties SPF and DKIM together. It tells receivers what to do when an email fails both, and sends you reports on who is sending mail as your domain.
Common questions
Send from a domain that passes.
Samva walks you through SPF, DKIM, and DMARC on your own domain, then feeds bounces and complaints into suppression so your reputation holds as volume grows.