adding digital signature to email?

[Tomasz Chmielewski]

Is it somehow possible to make Postfix add a digital signature to 
outgoing emails?

Most likely Postfix itself can't do it, but maybe there is some filter 
(similar to amavis, or dkimproxy) which can be used with Postfix, which 
lets digitally sign email (i.e. if From: is X1, sign with key K1)?


--
Tomasz Chmielewski
http://wpkg.org