1 Server: Apple XServe dual PowerPC G4 CPU 1.33Ghz RAID1
OS: Mac OS X Server 10.4.9
RAM: 2 GB
Users: 2500+.
Authentication: vpopmail
Storage: ~60GB.
Users Maildir Size: from few KB to about 1GB.
Dovecot version: 1.0 release
Protocols: pop, imap
Client Software: Squirrelmail Webmail client, many pop and imap clients.
Mailbox are on a 2 disk's RAID1 and dovecot indexes are on another disk.