Mail Scanning With Exim And The Exiscan ACL
by Michael Oliveri - Tuesday, 13 April 2004.
On our network, CPU utilization on a temporary filtering box (a 2.4GHz P4 single proc w/1 GB of RAM) consistently floats between 60-80% with antivirus turned off, but we have high traffic. I have not (yet) found a good traffic monitor, but some simple command line scripts to parse logs show we bounce an average of 7500-8500 messages per hour each day.

Overall, we have been very pleased with the Exim/Exiscan combination in scanning email for our user base of approximately 3500 dial-up, ISDN, and DSL users. Without scanning in place, our technicians received several calls per day from customers complaining about spam. Since implementing Exiscan, calls have been few and far between.

It's hard to argue with results like that, especially for a free product.

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