So now I rolled back to the old server and in less than 15 minutes I have delivered more than 25% of the queue.
Out of this I conclude that Imail 7.x and 8.x does not run very well with heavy traffic on w2003.
You can throttle internet-to-IMail flow by reducing the number of concurrent SMTP sessions to Imail in your IMGate:
transport_destination_concurrency_limit Limit on the number of parallel deliveries to the same destination, for delivery via the named message transport.
Create a new transport in master.cf by duplicating the standard smtp line, and name it "imail", and make the maxproc param "1" (vs default 50)
in transport.map, change each Imail domain like this:
isphuset.no smtp:[ip.ad.re.ss]
to
isphuset.no imail:[ip.ad.re.ss]
and in main.cf,
imail_destination_concurrency_limit = 1
...... which will prevent postfix from opening more than 1 SMTP client sending to Imail. This is a slow as you can go for deliveries. :))
A problem could arise if IMGate's inbound mailq for IMail domains is filling quicker than IMGate can send to IMail with one SMTP (if true, you are totally screwed).
With "1", if Imail is still refusing mail from IMGate, you can't really do any more with IMGate to fix the mess within IMail.
If IMGate's inbound queue is growing (which is not to say that it must be emtpy, but just stable), AND Imail is ok, then increase the 1 above to 2, watch IMail queue, repeat.
The objective is to smooth out spikes in inbound to Imail by buffering in IMGate, so the spikes don't send Imail queue into spiral of queue buildup. All inbound to Imail gets dribbled by IMGate to Imail with 1 SMTP session.
For the Imail outbound, you must also have Imail sending its outbound to IMGate, so Imail can dump its queue on the IP of IMGate without DNS/SMTP delays.
Of course, you should have the filtering in IMGate such that it is blocking 80% of inbound mail as spam anyway, which is a typical number these days for larger ISPs, and probably about where an operation such as yours will be.
Len
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