Sunday, August 10, 2003, 6:57:40 PM, you wrote:
I noticed slow delivery when queue is under higher load (e.g. delivering mail to thousands customers) New mails are delayed from 10 min. to 2 hours. I tried to set queuehi, queuelo and queuefill but with no effect. Can anyone give me some hints how to set queue parameters please?
Well, obviously when you have thousands of messages in the queue new mail has to go to the end of the line, and wait until its turn comes up.
Where could be the bottleneck of delivering? Can I allow more concurrent delivery attempts?
You can tune the delivery limits by editing $sysconfdir/module.* files. The MAXDELS, MAXHOST, and MAXRCPT settings are described in http://www.courier-mta.org/queue.html. You better know what you're doing; if the parameters aren't set right the server may not even start. As such, always back them up first, before messing around with them.
For esmtp, MAXDELS is the maximum number of messages sent via SMTP at any given time, and MAXHOST is the maximum number of messages sent via SMTP to the same domain, at any given time.
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