>Is the best to stop a dictionary attack by entering the IP in the Control
>Access box?

sure, if the attack is coming from a single ip.  If the attack is 
high-volume, your IMail machine will proably be very sluggish to DoS'ed as 
it fights the attack.

better to put the attacker's ip in a packet filtering router in front of 
the Imail machine.

>Any other options?

IMGate.

Len


http://MenAndMice.com/DNS-training
http://BIND8NT.MEIway.com : ISC BIND 8.2.4 for NT4 & W2K
http://IMGate.MEIway.com  : Build free, hi-perf, anti-abuse mail gateways


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