email gateway (transparent)

[ibnmaja al-andlusi <fedorian68 () yahoo co uk>]

hello everyone,

I would like to know the feasiability of implementing
a transparent email gateway to catch virues, and spam
between the network, and the firewall?

is there such a thing that has zero configuration, any
hints/howtos would be much apperciated, I would rather
stick to an open source solution based on linux

TIA

W.A.

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