Free email DNS tools.

SPF checker

Validate SPF syntax, includes and the 10-lookup limit.

Authentication

DKIM checker

Confirm your selector publishes a valid public key.

Authentication

DMARC checker

Read your policy, alignment mode and reporting.

Authentication

DNS checker

Audit every record mailbox providers query.

DNS

MX record checker

See which servers receive mail and in what order.

DNS

Domain health checker

SPF, DKIM, DMARC and MX in a single snapshot.

DNS

Domain reputation checker

Authentication health plus Spamhaus DBL status.

Reputation

Blacklist checker

Scan DNSBLs for your sending IPs and domains.

Reputation

Email verifier

Catch invalid and risky addresses before you send.

Spam score checker

Test copy and headers for filter triggers.

Inbox placement test

Primary, promotions or spam — across providers.

Email template checker

Rendering, links and spam signals in one pass.