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From: Wietse Venema (wietseporcupine.org)
Date: Tue Oct 23 2007 - 16:27:24 CDT
> I used qshape to see how many messages are in the queue, then I used postfix
> flush to push the messages.
> I tailed maillog and saw things were simply moving slow, and I wanted to
> make sure that there are no settings on my side that would or could slow
> this process down. I was hoping to see a non stopping stream of messages
> going out.
After "postfix flush" the delivery speed is determined by
- network latency,
- smtp process limit (in master.cf),
- smtp_destination_concurrency_limit (main.cf).
The Postfix "delays" logging gives finer detail of where mail spends
its time: before it enters the active queue, in the active queue
waiting for delivery, in connection setup (including DNS lookup),
and in actual mail transmission.