There was a thread on this mailing list back in March,
http://marc.info/?l=mutt-usersm=130016436305546w=2
List: mutt-users
Subject:application/pgp-signature is unsupported
From: Joseph xxx () gmail ! com
Date: 2011-03-15 4:44:57
which doesn't seem to have had a resolution.
I am facing the same problem now, but may have a bit more information.
The copy of mutt I'm using is fully supporting signed/encrypted emails.
Point in case, the earlier, signed message to this list
Date: Wed, 22 Jun 2011 04:10:36 -0400
From: Athanasius m...@miggy.org
To: Joseph syscon...@gmail.com, mutt-users@mutt.org mutt-users@mutt.org
Subject: Re: EXITCODE==255
presents no problems whatsoever. But there are some messages mutt fails to
interpret correctly. I think this all started when $work moved to Exchange.
Exchange seems to have the nice and friendly habit of rewriting all sorts of
things on delivery, although in this case I have no proof without the original
message (MIME info and attachments are scrubbed from the corresponding mailing
list archive).
The messages that fail have the following MIME structure:
I 1 no description [text/plain, quoted, windows-1251, 1.6K]
A 2 This is a digitally signed message part.[applica/pgp-signat, base64, 0
A 3 ATT1.c [text/plain, base64, us-ascii, 0.2K]
Part two is the signature, encoded in base64, and part three is a mailing
list footer, also in base64. Also note that the header Content-Type: is
multipart/mixed rather than multipart/signed.