PaulW - I'm guessing yours isn't 'busy' - what sort of spec, what are queue levels (from uptime,top, etc), and amount of memory and swap used?
At the moment its not too busy no, I'll agree, but it is getting more use.
Hosting a few sites on it, got a forum running too which has always got someone on (not as busy as OOF mind, but it has its moments), its also got postfix running as a vmail system with mysql backend. Also currently experimenting with a few people on flv encoding & streaming (as a friend is using for her showreel for getting a job
http://www.vestatron.com/show-reel.html.)
Postfix is handling about 20 email addresses so far, 7 which are heavy use (2 are mine). This will be expanded at somepoint as they will be supplied to certain members on the forum.
top - 09:31:47 up 20 days, 13:17, 1 user, load average: 0.00, 0.02, 0.00
Tasks: 82 total, 1 running, 81 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.3%us, 0.0%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 1026988k total, 585904k used, 441084k free, 103736k buffers
Swap: 506036k total, 5544k used, 500492k free, 222152k cached
gsi ~ # cat /proc/meminfo
MemTotal: 1026988 kB
MemFree: 442700 kB
Buffers: 103852 kB
Cached: 222324 kB
SwapCached: 1020 kB
Active: 217644 kB
Inactive: 191936 kB
SwapTotal: 506036 kB
SwapFree: 500492 kB
The only 'read' hog I have in regards to memory is clamd, but I'm looking into getting Kaspersky, as well its better and apparently less of a pig.