Email security

Check the DNS records that route mail and protect a domain from spoofing: MX, SPF, DKIM, DMARC and more.

5 toolsFree, no sign-up

MX Checker

List the mail servers for a domain in priority order and check that each one resolves to a public address.
SPF Checker

Validate a domain's SPF record, its all qualifier and the number of DNS lookups it needs against the limit of 10.
DMARC Checker

Read a domain's DMARC policy, reporting addresses and alignment settings, and see how strictly it is enforced.
DKIM Checker

Look up the DKIM public key for a selector you provide and check its presence, key type and key length.
Email Security Checker

Review a domain's complete mail posture in one pass: MX, SPF, DMARC, MTA-STS, TLS-RPT and BIMI.