Scaling - how many logins per day are people supporting?

[Michael Bull]

Hi all,
We've had IMP running for some time now, and we're watching how we might 
need to scale in the future.  Currently, we've got it running on a twin CPU 
Sun E250 with 2GB of RAM, with an IMAP server on a separate message.  It's 
supporting about 3000 logins/day (I just grep -c 'd the log for the current 
day and the word "success" to get that).   How many logins a day are other 
people supporting, and on what hardware?