All of this because there seems to be an increase of customers that can't seem to connect to the mail server to send mail, they are getting network errors, that the mail server is not responding or has timed out, etc. My thought was that upgrading might help if the upgrade is faster...Is it?
The CPU load on the server is really low (3 to 5%) and it only seems to affect sending email, the POP3 is running fine. The only clue I have is the incredible amount of spam we are catching daily (3 to 6,000) that is keeping the smtp service busy (receiving the spam). There are about 500 email boxes with 20 virtual domains. We use Declude for AV and spam.
Given the low CPU load, one possibility here is if you are using F-Prot, you may want to switch to use the 32-bit fpcmd.exe file with Declude Virus rather than than the 16-bit F-Prot.exe file. A small percentage of servers (for no reason we've been able to determine) have odd serious performance issues when running too many 16-bit processes, and exhibit symptoms similar to yours. So if you are using F-Prot.exe, it's worth switching the fpcmd.exe in case that is causing the problem (just make sure to remove the "/NOFLOPPY" option when making the change).
-Scott
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