At the moment the setup we're running is: 2.8ghz P4, 1gb DDR, 80gb 7200rpm HDD: Imail server, running POP3, SMTP, Webmail, and Queuemgr 2.4ghz P4, 512mb DDR: Running a sending only service.
sounds like it should be able to handle the load, but hot hardware needs to be configured, and maintained, for the mail operations so the hardware give good resutlts.
you've probably screwed up the disk partitioning, and suffer from disk i/o congestion.
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
not very much total, and an untypically low level of spam, which is now running about 75% of all mail traffic, according Brightmail, which corresponds roughly with what I see on several large IMGates I admin.
ie, if your traffic was typical, the 30K legit msgs would be accompanied by about 70K rejects, not 9K rejects. so count yourself lucky, many other aren't.
The current plans are to put two Debian boxes before the Imail one, to cleanse incoming mail and for routing outgoing email.
This is the approach adopted by many Imail admins, using IMGate as the MX and outbound gateways.
In addition to adding the front-end boxes, you need to fix why your current box is running so overloaded.
Len
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