We have a Compaq DL-360 (2 x 1,33 Ghz, 2 GB RAM) which worked pretty good with about 120 Domains. 2 Weeks ago we added 99 Domains and since then, the server is in under heavy load. The Queue Manager needs more CPU power, more than expected. We have about 10000 Mails "local deliver" per day and 3500 "Remote Deliver per day. Any idea to fix this? Any finetuning which i can apply?
Do you have a gateway in front of Imail to reduce the load from spammers/viruses/attacks?
As has been reported here many times, one of the best ways to reduce Imail's load is to block the majority of crap that comes in email today. Our Imail install sees about 1/3rd of your reported email load on an old dual processor PIII 733mhz Dell server with two mirrored 10k scsi drives and 1GB pc133 ram and no problems to date, except the odd 20MB file attachment that the system chews on for a little while. We also see about 10k incoming connections but we run ASSP(www.asspsmtp.org), on the same box, and it blocks all the crap.
ASSP takes a bit of time and effort to get installed and configured but it can be done fairly quickly, and with and delaying and HELO testing enabled, and everything else in testmode, it will immediately begin to reduce your email load, but being OpenSource, there is no official support besides the forums.
Many people run a separate email gateway server such as IMGate(http://imgate.meiway.com) with great success and if I understand correctly, there is paid support and setup help available. "IMGate will reject, typically, 70%+ of the inbound"
Doug Traylor
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