[c-nsp] Which would be ideal spam control device ?

[Kuppuraj Krishnan]

Hi ,

I work in an environemnt, that has got 3640 series routers
(Serial/FastEthernet/Async ports). L2 & L3  Switches(gigabit capable)
with hubs connected to them, handling about 250+ nodes. and about 15
WAN clients. Having inhouse Email servers and providing DNS to all the
nodes/WANs.

Though every nodes are having personal firewall / antivirus, but this
seems to be in sufficient when there's a spam/virus outbreak.

I very much need your suggestions & views about choosing an ideal
device that can protect my network as it is being frequently attacked
by spams/virus and chokes the same.

Thanks & regards,
Kuppu