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(mailcrypt.info)Signing

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Signing a Message
=================

   The function `mc-sign' will clearsign a message in the current
buffer.  `mc-write-mode' binds this function to `C-c / s' by default.

   When this function is called, Mailcrypt will prompt you for the
appropriate passphrase unless it is cached (Note: Passphrase Cache).

   Mailcrypt will then pass the message to PGP for processing.
Mailcrypt will call the functions listed in `mc-pre-signature-hook' and
`mc-post-signature-hook' immediately before and after processing,
respectively.  The signed message will replace the original message in
the buffer.  _Do not_ edit the message further with the signature
attached, because the signature would then be incorrect.  If you
discover you need to edit a message after you have signed it, remove the
signature first with the normal Emacs undo command `C-x u' (Note: Emacs
Undo.).

   The variable `mc-pgp-user-id' controls which secret key is used for
signing; it is described in Note: Encrypting a Message.  To
use a different secret key, pass a prefix argument to `mc-sign'.  (That
is, type `C-u C-c / s'.)  Mailcrypt will prompt for a string and will
sign with the first key on your secret keyring which matches that
string.