ZZoneCheckr
Email security tool

SPF, DKIM & DMARC Checker

Inspect the DNS records used to authenticate domain email. Check SPF and DMARC automatically, and optionally provide a DKIM selector.

DKIM requires a selector such as google, selector1, or default. SPF and DMARC do not.

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Why these records matter

SPF defines which servers may send mail for a domain, DKIM adds a cryptographic signature to messages, and DMARC tells receiving systems how to handle messages that fail authentication. ZoneCheckr reports what is published; it does not send test emails.