--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
[MESSAGE-FORMAT]."
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.
john
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