[Dovecot] Too many imap connections in state "idling"

Hi,

I have a "Ubuntu12.04 + dovecot-2.0.19" configuration in my server. My mailbox server is shared by ~ 10k domains. It works fine with ~50k accounts.

On average, my server has about 6K simultaneous imap connections during office hours. But I've noticed that this server has an average of approximately 4k connections in state "idling".

On other Dovecot servers the average connections in state "idling" is only 10%.

My doveconf -n: http://thiagoh.prv.digirati.com.br/doveconf-n.txt

Can someone help me?

Thanks

Thiago Henrique adminlinux.com.br