Our incoming gateway had totally 5000 mail in queue and it kept growing when i decided to switch back
in less than 45 minutes it has been deliverd to the old server...
One of my IMGAte/IMail clients got this tip from Ipswitch:
"default setting on the queue service of 4 listen pipes can go to 20 and had me increase it to 10... "
For your box, I would open up to max of 20.
On the IMGate box, limit postfix to 20 SMTP sessions per destination:
default_destination_concurrency_limit = 20
So don't tell me that there isn't a problem on the w2003 platform and that is a serius one as what i can see.
There is obviously a problem scaling up your Imail config.
As so often happens, high-volume IMail boxes work a LOT better with IMGate as MX, without exception. Plus you get the detailed logging in IMGate that shows exactly how Imail is behaving as SMTPD server.
Len
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