When using 'mml-secure-sign-pgpmime to sign one part of an email, valid
sigs get attached to new emails but not to replies.  Instead, when I
reply to a message, the signing directive seems to be inserted as plain
text and is not processed.

Switching to the 'mml-secure-message-sign-pgpmime, which signs the whole
message, appears to work for both replies and new messages.

I'm content to use the form that works, but I thought others might want
to confirm the bug and fix it if it is real.

Regards,
James