multipart/signed and QP - is this a dumb idea, or a good one?

I'm one of the people maintaining the Exmh MUA, and was recently fixing up
the PGP support.  One of the things that I noticed was that quite often,
various list processor software would seriously break the PGP signature.
The failure mode is that the text/plain is sent out with a '7bit' CTE,
the list software trims trailing blanks or expands tabs, thus breaking the
signature.

Would it be a Good Thing for Exmh to scan for known "problem sequences"
such as trailing blanks in a text/plain, and if found, force a QP CTE
so the list software isn't as likely to mangle things?  Or are there still
enough "I hate seeing =20 in my mail" non-MIME people out there?

(Of course, if they're seeing the =20 in their mail, they're probably going
to be equally torqued off by the fact there's a digital signature attached ;)

-- 
                                Valdis Kletnieks
                                Operating Systems Analyst
                                Virginia Tech

pgpEW4OQ6ydXT.pgp
Description: PGP signature