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RFC 6409, "Message Submission for Mail", November 2011

Note: This RFC has been updated by RFC 8314

Source of RFC: yam (app)
See Also: RFC 6409 w/ inline errata

Errata ID: 3995
Status: Verified
Type: Editorial
Publication Format(s) : TEXT
Reported By: Tony Finch
Date Reported: 2014-05-22
Verifier Name: Barry Leiba
Date Verified: 2014-06-03

Section 8.7 says: 

   NOTE: SMTP [SMTP-MTA] prohibits the use of domain name aliases in
   addresses and the session-opening announcement.  As with other SMTP
   requirements, RFC 5321 effectively prohibits an MSA from forwarding
   such messages into the public Internet.  Nonetheless, unconditionally
   resolving aliases could be harmful.  For example, if www.example.net
   and ftp.example.net are both aliases for mail.example.net, rewriting
   them could lose useful information.

It should say:

   NOTE: RFC 821 and RFC 1123 prohibited the use of domain name
   aliases in addresses and the session-opening announcement.
   Because of this it is still common for MTAs to canonicalize
   domains in email addresses.  However this requirement was dropped
   during the development of RFC 2821.  The current rules about 
   domain name aliases are set out in RFC 5321 section 2.3.5.

Notes:

This errata report is correct, but the above wording is not quite correct and needs to be examined carefully before a revised version goes into a revised document.

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