Email deliverability tools
Free checkers and record generators for SPF, DKIM, DMARC, MX, TLS, and blacklists.
Checkers
- MX lookupLook up MX records for any domain. Instant, free, plain English.
- SPF CheckerCheck a domain's SPF record — syntax, lookup count, and common issues. Instant, free, plain English.
- DKIM CheckerCheck a DKIM public key for a given domain and selector. Instant, free, plain English.
- DMARC CheckerCheck a domain's DMARC policy — what it enforces, what's missing, and where it aligns. Instant, free, plain English.
- Blacklist lookupCheck whether your mail-server IPs are listed on email blacklists. Instant, free, plain English.
- TLS CheckInspect both your domain's outbound submission server TLS and the inbound TLS posture announced via DNS (MTA-STS + TLS-RPT). Instant, free, plain English.
Record generators
- SPF GeneratorBuild a valid SPF record in seconds. Pick your senders, set the policy, copy the TXT record.
- DMARC GeneratorBuild a DMARC record in seconds. Pick a policy, add a reporting address, copy the TXT record for _dmarc.
- DKIM GeneratorGenerate a DKIM keypair in your browser. Copy the public DNS record; the private key never leaves this page.