>However, if you want to scan the attachments, it will cost you. The current
>solutions run about $5,000 and up for a typical server. And, they have some
>flaws (you have to run a mail server written by a company that excels in
>virus scanning, not Internet software). For example, most virus scanners
>force you to be an open relay. With WebShield SMTP, you have a choice of
>being an open relay or letting some messages go through unscanned.
If you let IMGate handle the anti-relay on the "edge" to internet,
then you can use one of these anti-virus / pro-open-relay thingies,
plus IMGate would stop some amt of spam from even getting to the a-v
box, plus IMGate could enforce a per-system max msg size so the a-v
box doesn't get bogged down scanning 20 Mb attachments.
Here's how that sandwich would stack up:
1. IMGate as MX and Internet mail gateway.
2. Commercial A-V pkg on its own beefy box as open-relay but not an
MX so not an open-relay risk. might as well block Internet access to
it at your border router, since it only talks to IMGate and Imail exclusively.
3. Imail, not an MX, just SMTP AUTH + POP3 + Web msging
Imail would also forward its outbound to 2. to catch that virus out
as well as in.
Len
http://BIND8NT.MEIway.com: ISC BIND 8.2.2 p5 installable binary for NT4
http://IMGate.MEIway.com: Build free, hi-perf, anti-spam mail gateways
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