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Zitat von Mark Blackman <firstname.lastname@example.org>:
> 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.
If username/password with TLS is enough there are fraud-proof ways do
it Postfix content-filter, if not be sure to use at least ID-cards
class3 with your MUA.