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Re: [ietf-smtp] Stray <LF> in the middle of messages

2020-06-06 15:09:33
Sorry, that should have been a reference to the next-to-last
paragraph of Section 8 of RFC 6409.  But the principle (and,
with the exception of handwaving about extensions, the text) are


--On Saturday, June 6, 2020 16:03 -0400 John C Klensin
<john-ietf(_at_)jck(_dot_)com> wrote:

--On Saturday, June 6, 2020 19:36 +0100 Paul Smith
<paul(_at_)pscs(_dot_)co(_dot_)uk> wrote:

I suppose with a submission server you could be more flexible,
but, to be honest, I've *never* come across a case where not
treating a lone LF as a line break has been a problem.

And that is exactly why the last sentence of the introductory
paragraph of Section 8 of RFC 4409 says:

      "Any message forwarded or delivered by the MSA MUST
      conform to the requirements of [SMTP-MTA] and

In other words, perfectly reasonable for a submission server to
reach a local agreement that bare LFs are to be treated as line
terminators but, by the time the message reaches the public
Internet, it needs to have fixed those.


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