It appears that Jon Callas  <[email protected]> said:
>And look at it -- l= is intended to increase robustness and strictness of 
>interpreting the message.

I don't see how that followes. In all the years I've been futzing with
email I can't ever think of a time where a message showed up with
added crud at the end and the right thing to do was to discard the
crud and keep going. (I'm ignoring the old sendmail bug that added
blank lines.) Maybe you can tell it's from a list and the crud is
benign, or maybe you can't and you should treat it as suspicious.

The rationale I recall for l= is that it would let mailing lists put a
footer on messages. That never seemed very persuasive, both because
lists make a lot of other changes to messages, and because it opens up
a hole you can drive an ocean liner throught.

I also recall people claiming with a straight face that MUAs would
show the signed and unsigned parts of a message in different colors so
the user could decide which parts of it to believe. I hope I don't
have to explain why that was a terrible idea.

R's,
John

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