mail configuration (Score 5)

Hi,
a couple of years ago we had the same problem till I discovered that all our mailboxes where in one mail spool directory. This was a huge bottleneck and after adapting qpopper and configuring sendmail to a split mailspool dir load came down to 1. (split mailspool is /mail/a /mail/b /mail/c and all users which will begin with an a will be placed in /mail/a ... etc ... )

check above first before you buy hardware