> Do you really think that > you run into performance problems with 25 msg/sec ? Do you _really_ > think that 25 msg/sec is so bad ? 25 msg/sec times 60 are 1500 msg/min > times 60 are 90000 msg/hour times 24 are 2160000 msg/day ! Do you really > think that your machine will have to handle over 2 million messages > _every_ day ? Isn't that 2 million message think more a peak value on > high load situations than the approximately everyday situation ?
At peak loads, not really. The MTA front ends on the system I work on route about 1.5 million messages a day. More specific, one backend server (Sun E4000), with 70k users, accepts approx 10-20 messages per second with 30 or so POP attempts per second (Qpopper, no IMAP yet). This all at peak times between 10AM and 2 or 3PM. I agree that Su isn't seeing the performance he should be getting, but I also see where he would _need_ this performance. Other alternatives for Su are out there, such as clustering IMAP back ends using either Perdition http://www.vergenet.net/linux/perdition/ or the Murder system. His use of Linux should not be a major issue.
