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Subject: Re: Clamav-90_2 Lockup with freebsd 6.2
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Had a similar behavior here, but with other MTA (qmail, clamdscan 
getting used from simscan).

After raising MaxThreads from 10 (default) to 40 CPU usage got back to 
its normal consuming level.

No idea if this info can help, but that was my recent experience.