We're in the process of evaluating Imail for our users. I'd like to know what kind of performance other users were getting out of it, as I think the server is under pretty high load and not sure if it is Imail generally sapping CPU cycles or else we've got something in the config horribly wrong.
If CPU load is the issue, the first thing to do is go to Task Manager, click on the Processes tab, and click the CPU button. That will sort the processes by CPU usage; the one(s) at top are causing the problem.
At the moment the setup we're running is: 2.8ghz P4, 1gb DDR, 80gb 7200rpm HDD: Imail server, running POP3, SMTP,
This should be able to handle about 250,000 E-mails/day, complete with full spam and virus scanning.
The 2.8 machine routes all outgoing messages through the 2.4 to relieve the load a bit. The 2.8 machine is only a temporary machine that we're testing on, and there's a proper Xeon machine coming with SCSI RAID etc. This is a fairly average day's usage for us: SpamContent 8464 LocalDeliver 29084 RemoteDeliver 9376
There's something unusual causing the problem.
The 2.8 machine is coping with this load, but only just. It regularly has 100% CPU usage for several minutes which causes the POP3 and webmail service to slow down. The current plans are to put two Debian boxes before the Imail one, to cleanse incoming mail and for routing outgoing email. Spam/virus filtering will be done at this level so Imail has less traffic to process.
There is no need to worry about that plan -- your server should be able to handle 10 times the current load.
The next time the CPU goes to 100%, try the Task Manager trick to see what process(es) are using up the CPU time. That should help determine where the problem is.
One quick thing you can check: do you have an on-access virus scanner running on the server? If so, have it exclude the \IMail directory (so it doesn't scan E-mails in the spool, or in mailbox files, which can cause problems such as lost mail and high CPU usage).
-Scott
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