I am looking for suggestions to reduce the amount of resources that Imail/Declude use. We are a small ISP and now and then we get hit hard by a spammer mass mailing our users ( which equal ~20,000 ) and we get hit our mail server all but shuts down due to the mass amount of incoming mail and Declude scanning each individual email, etc. Our mail server is a 2u Dell server with 2 pentium 1.13 gHz CPUs and 1 gb of ram.What you are really looking for is a way to deal with the DDoS attack that you are experiencing.
Unfortunately, there isn't any easy way to deal with this. If it is just a DoS attack (coming from one IP), you can block that IP in the IMail SMTP Control Access file. If it is a DDoS attack (many IPs), you can either try blocking them, or use a program such as BlackIce Server to try to block the attack.
-Scott
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