I completely agree with John. A note on the errata is fine (since it has already been marked as verified).

At 2:28 PM -0400 5/23/14, John C Klensin wrote:

 Unless I'm wrong about how motivated any of us are to do a 6409
 update to fix this, can we just note (as a comment on the
 erratum since it has gotten this far) that there is an issue
 with the text (as noted) and that it needs to be examined
 carefully in any rewrite.  I agree with Randy's comments about
 clarity, but doubt that is worth spending a lot more time on now
 unless something thinks the issue is really important enough to
 justify a revision.

    john


 --On Friday, 23 May, 2014 08:07 -0700 Randall Gellens
 <[email protected]> wrote:

 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".

  --------------------------------------
  You may review the report below and at:
  http://www.rfc-editor.org/errata_search.php?rfc=6409&eid=3995

  --------------------------------------
  Type: Technical
  Reported by: Tony Finch <[email protected]>

  Section: 8.7

  Original Text
  -------------
     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
  -----


  Instructions:
  -------------
  This errata is currently posted as "Reported". If necessary,
  please use "Reply All" to discuss whether it should be
  verified or rejected. When a decision is reached, the
  verifying party (IESG) can log in to change the status and
  edit the report, if necessary.

  --------------------------------------
  RFC6409 (draft-ietf-yam-rfc4409bis-03)
  --------------------------------------
  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
-------------- Randomly selected tag: ---------------
Nostalgia isn't what it used to be.

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