Message Submission for Mail
RFC 6409, “Message Submission for Mail”, is an Internet Standard document published in November 2011 by R. Gellens, J. Klensin. It obsoletes RFC 4409. It has since been updated by RFC 8314. The canonical text is published by the RFC Editor.
Abstract
This memo splits message submission from message relay, allowing each service to operate according to its own rules (for security, policy, etc.), and specifies what actions are to be taken by a submission server.
Message relay is unaffected, and continues to use SMTP over port 25.
When conforming to this document, message submission uses the protocol specified here, normally over port 587.
This separation of function offers a number of benefits, including the ability to apply specific security or policy requirements. [STANDARDS-TRACK]
What “Internet Standard” means
A mature, widely-implemented specification that has completed the full IETF standards process — the highest maturity level on the standards track.
The canonical text of RFC 6409 is hosted at rfc-editor.org. Available in TXT,HTML.
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