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David Touzeau put forth on 10/23/2010 7:30 AM:
> 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.
Why don't you simply setup a VPN tunnel between the sites? This is
exactly the scenario for which VPN technology was created:
The two routers currently in place may already have VPN capability that
you can simply configure in a few minutes. If not, setup a couple of
Linux VPN gateways, one at each site. After that, simply create a host
file entry on each SMTP server with the FQDN of the other and its
RFC1918 address, so each sends SMTP to the other over the encrypted VPN
VPN is not new--been around for 10 years or so, and they are _widely_
used. Have you never heard of a VPN?