>how do you block this or protect against it...it seems so hard to

yep, there's very little that can be done, best is to move the 
incoming connections to a front end gateway  so it gets the DoS 
instead of Imail mailbox server.

Len

http://MenAndMice.com/DNS-training Austin,TX: 23,24/04; SFO,CA: 
7,8/05
http://BIND8NT.MEIway.com : ISC BIND 8.2.3 "NT3" for NT4 & W2K
http://IMGate.MEIway.com  : Build free, hi-perf, anti-abuse mail gateways


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