[Dovecot] Timeout Value

[JackyC at umac.mo]

Dear All,

I constantly encounter 'dovecot-auth', 'login-imap', 'login-pop3' and 
'imap' processes consume 100% CPU.
I run 'ps' and found those hanged up processes were running for a long 
time.
I am wondering whether dovecot.conf has some configuration parameters that 
timeout those processes (or kill those after certain period of time).
I am using dovecot 1.2.11 on RHEL 5.3.

Many thanks ~~~

Yours Sincerely,
Jacky Chan