Le 14/02/2011 11:08, Frank Bonnet a écrit :

Hello

I've googled around to tune a bit my mailhub ( AMD64 FreeBSD 8.1, 12 Gb RAM,

I guess you mean 12 Go (or 12 GB) ;-p

2 Tb raid5 disks , ~4000 mailboxes unix users ) but I am a bit confused,

All my clients use thunderbird as MUA ( IMAP, IMAPS ) to connect to the mailhub no direct access to the machine.

Any of you guys has some pointer to give ?

the answer is: when tuning is needed, you will know it: you will have concrete problems.

if you observe no problem, tune your week-end instead. as the saying goes: "premature optimisation is the root of all evil".