This looks correct to me, although it's right at the edge of what's acceptable
in an errata.
Ned
> 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. 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
> -----
> 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
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