On Wed, 10 Aug 2005, Steve Buehler wrote:
I know of one company that has a series of mail servers. server1 receives
all incoming mail and checks for spam deleting any spam. Then it sends it to
server2 which checks for viruses and deletes them when found. Then it sends
it to server3 for pickup by the clients. Of course they won't tell me their
setup, but they will do the setup on my server for a very LARGE fee. About
$3,000. I could setup a separate email server altogether for that. The
here it is for free:
0.0.0.0 -- MX 30 -|- MX 20 -|- MX 10 -- mailstore
The symbol '-|-' represents a filter - Iptables can do it fine
- which prevents any port 25 traffic to pass from left to
right, EXCEPT for the next higher numbered MX unit
Filtering of various types happens at each stage - RBL on the
'30; more smap and AV at the '20 - and it has the pleasant
effect of smoothing the inbound mail load
This is a common setup I have used at ISPs I have run.
-- Russ Herrold
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Copyright (C) 2005 R P Herrold | Owl River Company
herrold@xxxxxxxxxxxx | "The World is Open to Linux (tm)"
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