Sender ID: Authenticating E-Mail

Document Type Expired Internet-Draft (marid WG)
Author Jim Lyon 
Last updated 2015-10-14 (latest revision 2004-08-18)
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state Expired (IESG: Dead)
Action Holders
Consensus Boilerplate Unknown
Telechat date
Responsible AD Ted Hardie
Send notices to

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Internet mail suffers from the fact that much unwanted mail is sent using spoofed addresses -- 'spoofed' in this case means the address is used without the permission of the domain owner. This document describes the following: mechanisms by which a domain owner can publish its set of outgoing MTAs, mechanisms by which SMTP servers can determine what email address is allegedly responsible for most proximately introducing a message into the Internet mail system, and whether that introduction is authorized by the owner of the domain contained in that email address. The specification is carefully tailored to ensure that the overwhelming majority of legitimate emailers, remailers and mailing list operators are already compliant.


Jim Lyon (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)