I've just upgraded to Courier-IMAP 2.1.2 from a version from a year ago. The upgrade went fine and the server works fine but I noticed that outgoing bandwidth usage is way up on the server. The old Courier would sit around 1 Mbps, the new is 5 Mbps for exactly the same user load. Stopping the server and moving back to the old version puts the outgoing bandwidth back where it was originally. Something in my installation is causing the server to use a ton of bandwidth, yet still apparently work fine.
I'm going to do some more debugging and try to determine if it's the IMAP or the POP and whether I can actually capture some of this traffic. I just wanted to see if anyone else noticed this and could tell me right off what the problem is. In general, the machine is pretty well up to date using gcc 3.2.2, latest OpenSSL, etc. It just seemed like it was finally time to upgrade Courier-IMAP which has been working fine for the last year.
Jeff
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