Bug#584678: Other MIME transformations
On a system running sendmail-8.15.2-6, I observe sendmail performs other
transformations on MIME encoded parts as well. Unfortunately, this has
the effect of invalidating any PGP clear text signature that may cover
the part. Please see the entire thread at [1].
An example of message that is transformed when sendmail consumes it as a
smtp server is [2]. Namely, the line
> > X11 screens? =20
is transformed into
> > X11 screens?=20=20
Of course, such transformation is valid in that the altered message
renders the same in a MUA, but to press the point again, it breaks PGP
signatures.
An example of message that is transformed when sendmail sends it as a
smtp client is [3]. Namely, the lines
=2E..
are transformed into
...
and the binary base-64 parts are reflowed from 72 chars per line to 60
chars per line. Note that the receiving server advertises 8BITMIME, so
QP-recoding to make message 7-bit is no excuse.
[1]
http://marc.info/?t=147458352900003&r=1&w=2
[2]
http://marc.info/?l=gentoo-user&m=147481257910736&q=raw
[3]
http://marc.info/?l=mutt-users&m=147417425713497&q=raw
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