Hi,

I noticed that (with epg and recent Gnus) a S/MIME-signed message is
sent out even when the passphrase entry has been unsuccessful (because
pinentry’s cancel button was pressed, or because a wrong passphrase has
been entered multiple times).  The sent-out message contains some
invalid signature.

OpenPGP-signed messages behave reasonably, i.e. one finds oneself in the
message buffer after a failed passphrase entry.

Any ideas where to look to fix this in S/MIME?

Christoph