After changing this two values (TcpTimedWaitDelay: 60 seconds / MaxUserPort = 25000 ports) there was not more one single "MX connect failed" or "status=3" in the logfiles. All messages was delivered immediately.
these are great band-aid settings, but the problem remains that causes Imail to leave so many TcpTimedWait open. It looks like IMail's interaction with tcp/ip has serious problems.
btw, 60 seconds is still VERY patient. The busier your server is, the less patience it should have with slow MXs. I suggest you experiment with 15 or 30 seconds. I bet there will be no ill effects. The policy is "if the MX can't respond in 15 seccods (it's screwed up), and my SMTP has better things to do than wait for it"
Of course, it looks like this Imail problem isn't being extremely patient with very slow MXs, but Imail and the local tcp/ip interaction having some serious defect causing all these tcp sessions to hang waiting, rather than closing.
Len
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