Playing with the possibilities of sup's hooks, I stumbled over the
sig-output hook. If I am not mistaken, signature has to meanings:

a) the signature block := text attached to the body of an message,
   containing information on whatever the sender wants to inform
   everybody (s)he is mailing to.
b) the cryptographic PGP/smime signature of the message ensuring the
   identity of the sender.

If I am not mistaken, the sig-output hook seems to apply to the
signature type b)?

If so, it might be clarifying to change the description to:

---------------------->%----------------------
sig-output
----------
File: /home/ruthard/.sup/hooks/sig-output.rb
Runs when the PGP signature output is being generated, allowing you to
add extra information to your signatures if you want.

Variables:
signature: the signature object (class is GPGME::Signature)
from_key: the key that generated the signature (class is GPGME::Key)

Return value: an array of lines of output
---------------------->%----------------------


Yours, Ruthard

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Emails bitte verschlüsseln und signieren.
Meine PGP-Id: AC5AC6C2