Is your mail server compliant?
Check your sending domain in 30 seconds — DNS authentication, transport security, and RFC 2142 role addresses. No signup required for the free check.
What does this check?
Five categories every modern receiver looks at.
A failure in any one of these can quietly route your mail to spam — even when nothing else is wrong.
DNS authentication
SPF, DKIM, and DMARC records — the three signals receivers use to decide whether your mail is spoofed.
Transport security
MTA-STS and TLS-RPT publish your TLS expectations and let receivers report failures. RFC 8461 + 8460.
SMTP hygiene
EHLO banner, STARTTLS on submission, certificate validity, From-header DMARC alignment.
Server health
Reverse DNS / FCrDNS for the MX, MX reachability, and clock drift (DKIM signatures depend on accurate time).
RFC 2142 role addresses
postmaster@, abuse@, admin@ — required for blacklist self-removal and basic operator hygiene.
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