I think the wording is unclear and should be improved. See in-line:
At 3:59 AM -0700 5/22/14, RFC Errata System wrote:
The following errata report has been submitted for RFC6409,
"Message Submission for Mail".
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You may review the report below and at:
http://www.rfc-editor.org/errata_search.php?rfc=6409&eid=3995
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Type: Technical
Reported by: Tony Finch <[email protected]>
Section: 8.7
Original Text
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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.
Corrected Text
--------------
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.
Because of what? The prohibition on CNAMEs?
"it is still common for MTAs to" should be worded as "some MTAs" to
be more factual (otherwise it raises questions of how common).
However this requirement was dropped
What requirement was dropped? The wording should be clear.
during the development of RFC 2821. The current rules about
domain name aliases are set out in RFC 5321 section 2.3.5.
Notes
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Instructions:
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RFC6409 (draft-ietf-yam-rfc4409bis-03)
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Title : Message Submission for Mail
Publication Date : November 2011
Author(s) : R. Gellens, J. Klensin
Category : INTERNET STANDARD
Source : Yet Another Mail
Area : Applications
Stream : IETF
Verifying Party : IESG
--
Randall Gellens
Opinions are personal; facts are suspect; I speak for myself only
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Scandal is gossip made tedious by morality. --Oscar Wilde
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