I'm posting a reply which I received from "Emin Akbulut" here: Testing "hundreds of different email messages at the same time" is a bit excessive; ram usage, harddisk I/O bottleneck, etc... In my case if threads are more than 16 then server may become non-responsive because of virtual memory is too high. SA is not a cpu hunger application but it uses quite high memory, especially spamassassin.exe (50 MB avg. per session)
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