I would think it would always be better to use hyperthreading if your o/s and app can use it.
fwiw,
probably not much, for the majority of Imail servers, since they are mostly limited by disk i/o, not CPU, so how much does hyperthreading help disk i/o?
In any case, none of these tricks make any measurable improvement unless your box is severely stressed, and with most people over-buying Godzilla boxes, only the highest volume boxes, burdened with content-scanning and webmail/imap/mega-mbx-files, manage to stress themselves.
Severe mailserver stress, aka scaleability, is alleviated most effectively with multiple boxes to offload from the mbx server (content-scanning, AV scanning, MX front end), rather than trying to "buy more/go faster" in one box. But since multiple boxes requires more skills, throwing money at stress is the usual solution.
Len
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