[yusufu]

I run Zimbra 4.5 on my production server. For the past week, I have been having HUGE mail queues on my server.
I have about 5700 users and it's a real hassle when they don't get their mails on time.
this is what I get when i run mailq command
[zimbra@mx ~]$ mailq
.
.
.
.
-- 209783 Kbytes in 3381 Requests.

How do I optimize the mail queue, especially during peak period.