We altered both and do not know if this particular one helped.
I expect the TCP tuning may help where stressed machines are stressed at STMPD stage, but not yet overwhelmed and capped by disk congestion.
By opening up the TCP params, such a machine will be able to receive more mail/less connection refused until pushing the disk into congestion.
If disk congestion is already the limit, then fiddling with TCP params won't help, could probably make disk congestion worse, assuming that IMail prioritizes receiving mail over reading mailboxes and sending mail. SMTP receiving is real-time, the other two are not because their msgs are already on disk.
Len
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