Sorry to say it but Imail sucks on performance.
One of the boxes handling Imail is a 4way 20000$ box and can't handle more than around 35 000 mailadresses before its slowing down.
FYI, we have customers who are able to scan as much as about 500,000 E-mails/day on a single IMail server (both virus and spam scanning). While that load requires a lot of computer knowledge (setting up partitions well, defragmenting, RAID, network troubleshooting, etc.), it can be done.
In general, a single 500MHz CPU should be able to handle virus scanning, spam scanning, and general IMail operations on up to about 50,000 E-mails/day. That is without spending a lot of time configuring the server correctly.
If those are 35,000 E-mail addresses averaging 10 E-mails a day, your server should be able to handle it (with virus/spam scanning), but it may require extensive computer knowledge and troubleshooting.
-Scott
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