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Zitat von David Touzeau <email@example.com>:
> Yes it for a company between remote sites trough internet that need to
> be sure that documents cannot be opened.
> i know pgp but there no informations how we can hook postfix or there is
> not such filter that should perform this operation.
Maybe a littele overkill but if it's demanded:
http://www.djigzo.com is a Opensource S/MIME Gateway acting as
after-queue content filter with Postfix and is configurable with
policies like all mail to/from some domain/user must be encrypted or
denied among other nice features.