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On 27 Oct 2010, at 13:02, Tomasz Chmielewski wrote:
> 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)?
That's a job for the MUA, not the MTA. There's no fraud-proof way for postfix to know who is sending the email.