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Zitat von Tomasz Chmielewski <firstname.lastname@example.org>:
> 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)?
If you intend to use digital signatures according to X509 PKI have a
look at http://www.postfix.org/addon.html#security-gateway. We use
Djigzo and it is works as expected with many useful features like
policy based signing/encryption and the like.