MX Checker
Find mail exchanger records and priorities for a domain.
- MX hosts
- Priorities
- Missing MX warnings
Free diagnostic tools
Email Deliverability Tools
Diagnose the DNS records that help mailboxes send reliably, reduce spoofing and protect your domain reputation.
Email Deliverability Tools
Select a tool and run a live check with clear findings, recommendations and technical details.
SPF Checker
Find and analyse SPF records for sender authorisation.
- SPF TXT records
- Multiple record warnings
- Estimated DNS lookup mechanisms
DKIM Checker
Check a DKIM selector under selector._domainkey.domain.
- DKIM record presence
- v=DKIM1 check
- p= public key check
DMARC Checker
Check DMARC policy, reporting tags and enforcement readiness for your domain email.
- p, sp, pct, rua and ruf tags
- Alignment settings
- Missing or p=none warnings
MTA-STS Checker
Check MTA-STS DNS and policy file availability.
- _mta-sts TXT record
- HTTPS policy file
- version: STSv1 check
TLS-RPT Checker
Check SMTP TLS reporting records for delivery encryption visibility and MTA-STS support.
- _smtp._tls TXT record
- v=TLSRPTv1 detection
BIMI Checker
Check default BIMI DNS record and DMARC readiness guidance.
- default._bimi TXT record
- v=BIMI1 detection
- DMARC enforcement reminder
Email Blacklist Checker
Check a public mail IP against common DNSBL zones.
- Resolved IPv4 address
- DNSBL listings found
- Clear or listed status
