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Zitat von David Touzeau <firstname.lastname@example.org>:
> Yes i heard about VPN but in some cases in a big environnement you
> cannot play with networks and firewalls as you like.
> And there is a lot of remote sites to discuss, create VPN trought all
> theses remote sites is to complicated to maintain.
> yes i need to find a plugin like djigzo but djigzo is too heavy product
> (postgrey, web server... ) that requires too much components to
As said it depends:
- If you simply want to encrypt between a small number of sites use
enforced TLS with cert checking
- If you need encrypt mail traffic and others between a small number
of sites with trust relationship use some form of VPN
- If you need ad-hoc encryption of e-mail with a number of mail
recipients implement some form of PGP or S/MIME gateway
I can say it is not that hard to setup Djigzo and it provide a poliy
drive way to handle encryption and signing for e-mail.