[ Free tool · Email Authentication ]
DANE / TLSA Checker
Check DNSSEC-signed TLSA records that lock down SMTP TLS.
[ About this tool ]
This DANE checker looks up the TLSA record at _25._tcp for each of your MX hosts, confirms it is DNSSEC-signed and flags usage and matching types that are risky for SMTP (RFC 7672).
How to read the results
- ›TLSA records only count when DNSSEC validates them.
- ›3 1 1 (DANE-EE, public key, SHA-256) is the most common and robust choice.
- ›Publish the next key's TLSA before rotating certificates.
Frequently asked questions
What is DANE for email?
DANE uses DNSSEC-signed TLSA records to tell sending servers which certificate your mail server uses, so connections cannot be downgraded or intercepted.
DANE or MTA-STS?
Both protect SMTP TLS. DANE needs DNSSEC; MTA-STS needs an HTTPS policy file. Many organisations deploy both.
Learn more in our guide: What is MTA-STS? Setup Guide, Record and Policy File
Enterprise provenance
Why top financial institutions and governments retired their email security dashboards.
Traditional email authentication platforms sell you a dashboard and ask your engineers to do the labour. In high-stakes environments, manual oversight means delayed enforcement, configuration drift and unmonitored shadow domains.
EmailAuth is the agentic email provenance platform. Our agents enforce p=reject, keep third-party senders aligned and move your domains to full RFC 9989 compliance, the new DMARC standard,, with human-in-the-loop auditability.
SaaS · Dedicated tenancy · Air-gapped on-prem · BYOK encryption
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