Hello,
is this list an appropriate place to discuss PGP/MIME topics?
Please see the following example message:
https://bugzilla.mozilla.org/show_bug.cgi?id=1690603#c16
There is one line marked with
"---> preamble line inside signed content".
Thunderbird 78 had added a non-empty preamble line, which was removed by
a mail transport agent, causing the signature verification to fail.
Perhaps a future revision of RFC 3156 could state that preamble lines
inside the signed payload MUST be empty - in the hope that no transport
agent will add their own preamble lines.
(TB 91 contains a coincidental change that produces empty preamble
lines, I haven't yet investigated what had caused this, but it likely
has the side effect to fix the reported scenario.)
I don't know if there are any transport agents that ADD preamble lines -
hopefully there aren't.
Regards
Kai
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