>I am looking at installing IMail as a Gateway to my Imail server. Following
>the IMGate theory. Would I be better off installing bind on the Gateway
>machine so that IMail could do lookups locally rather than querying a DNS
>server on my network?
IMGate used DNS voraciously, many queries for every single message, so if
your DNS is not in good shape, you should install DNS on the IMGate machine.
>Would it be that much faster?
hard to measure, but accessing local DNS and its cache will be faster than
accessing across the network.
>I am looking for
>reducing the time to process email?
IMGate does lots of DNS lookups for every msg, and can scan every msg
end-to-end for filtering. But since that's back-office work, it really
doesn't impact delays for the front-offoce users.
In addition to DoS defense, here's the kind of message reject stats, for
yesterday, from an ISP in LA whose IMGate + BIND I installed and maintain
5 SMTP invalid [EMAIL PROTECTED]
9 RBL socks.relays.osirusoft.com
10 ACL header checks
13 SMTP unauthorized pipelining
40 RBL dynablock.wirehub.net
91 RBL orbs.dorkslayers.com
148 ACL unauthorized relay
186 ACL body checks
389 RBL relays.ordb.org
566 RBL proxies.relays.monkeys.com
620 ACL [EMAIL PROTECTED]
735 DNS no A/MX for @recipient.domain
926 RBL blackholes.wirehub.net
1115 DNS timeout for MTA PTR hostname
1165 DNS nxdomain for MTA PTR hostname
1390 ACL unknown local user
3088 DNS no A/MX for @sender.domain
10496 TOTAL
Len
www.menandmice.com/DNS-training : DNS Training
BIND8NT.MEIway.com : ISC BIND for NT4 & W2K
IMGate.MEIway.com : Build free, hi-perf, anti-abuse mail gateways
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