Zitat von David Touzeau <da...@touzeau.eu>:
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.
Regards Andreas
smime.p7s
Description: S/MIME Cryptographic Signature