Strip signed-text-markers from inline-clearsigned messages and strip surrounding text
mail-gpg makes sure it's clear which part of a inline-clearsigned message actually was signed my checking for or inserting marker-lines so the message looks like this one:
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
blafoo
-----END PGP SIGNED MESSAGE-----
I would rather strip anything before and after the signed text from being passed on to the list.