Articles

SMTP DANE and TLSA: secure mail delivery with DNSSEC

A guide to SMTP DANE, TLSA certificate association records, DNSSEC validation, downgrade protection and safe mail-server deployment.

IRIROSG Editorial·2026-11-09·1 min read·71 body words

SMTP DANE and TLSA: secure mail delivery with DNSSEC

DANE uses DNSSEC-authenticated TLSA records to signal secure SMTP delivery expectations and associate receiving server certificates with DNS identities. This guide examines the MX and TLSA lookup path, certificate matching, key rollover, compatibility with MTA-STS, operational monitoring and safe deployment. It distinguishes transport security between MTAs from end-to-end email encryption. Full technical guidance is available in Persian.

This is an English overview. The complete original article is currently published in Persian.

TRACEABLE KNOWLEDGE

Sources & further reading

IETF RFC 7672 — SMTP DANEhttps://www.rfc-editor.org/rfc/rfc7672.html

IETF RFC 6698 — TLSA resource recordshttps://www.rfc-editor.org/rfc/rfc6698.html

Microsoft Learn — SMTP DANE and TLSAhttps://learn.microsoft.com/en-us/purview/how-smtp-dane-works

CaptainDNS — نمودار آموزشی TLSAhttps://www.captaindns.com/de/blog/dane-tlsa-complete-guide

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