disable IMAP IDLE

[Chris Mattingly]

The RFC for the IDLE says:

This document specifies the syntax of an IDLE command, which will
allow a client to tell the server that it's ready to accept such
real-time updates.

This doesn't say anything about keeping connections open, it only talks 
about the near-instant new email notification.

-Chris

On 11/23/2010 10:01 AM, Ron Vachiyer wrote:
>
>
> > Date: Tue, 23 Nov 2010 14:44:34 +0000
> > From: iane at sussex.ac.uk
> > To: proutfoo at hotmail.com; info-cyrus at lists.andrew.cmu.edu
> > Subject: Re: disable IMAP IDLE
> >
> >
> >
> > --On 22 November 2010 18:40:37 -0500 Ron Vachiyer 
> <proutfoo at hotmail.com>
> > wrote:
> >
> > >
> > > Hello,
> > >
> > > I thought it was possible in Cyrus to disable the IDLE functionality,
> > > either with imapidlepoll: 0 in imapd.conf, or by commenting idled in
> > > cyrus.conf. However, having both disabled, clients still connect and
> > > maintain their socket open on tcp 143. Is it not possible or am I 
> going
> > > about it wrong?
> >
> > I thought sessions remained open for efficiency, regardless of IDLE, 
> until
> > closed by the client or 30 minutes have elapsed.
> >
> > IDLE just lets the server notify the client if new email arrives, 
> doesn't
> > it?
> >
> > Even without IDLE, there are benefits in leaving the session open.
>
> Hello,
>
> I won't argue since clearly I am in the minority ;)  Using 
> courier-imap on our Plesk servers, TCP/143 is closed after every new 
> mail verification.  A dovecot server I checked does the same.  Cyrus 
> seems to allow the session to be maintained, and yes, it does not 
> advertise IDLE.
>
> Below is an example courier-imap capability;
>
> * OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE 
> THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA ACL ACL2=UNION 
> STARTTLS] Courier-IMAP ready. Copyright 1998-2004 Double Precision, 
> Inc.  See COPYING for distribution information.
> . CAPABILITY
> * CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE 
> THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA ACL ACL2=UNION STARTTLS
>
>
> this one is cyrus 2.4.4
>
> . capability
> * CAPABILITY IMAP4rev1 LITERAL+ ID ENABLE STARTTLS AUTH=PLAIN SASL-IR 
> ACL RIGHTS=kxte QUOTA MAILBOX-REFERRALS NAMESPACE UIDPLUS 
> NO_ATOMIC_RENAME UNSELECT CHILDREN MULTIAPPEND BINARY CATENATE 
> CONDSTORE ESEARCH SORT SORT=MODSEQ THREAD=ORDEREDSUBJECT 
> THREAD=REFERENCES ANNOTATEMORE LIST-EXTENDED WITHIN QRESYNC SCAN XLIST 
> URLAUTH URLAUTH=BINARY X-NETSCAPE COMPRESS=DEFLATE
> . OK Completed
>
> I was asked by IT to not permit IDLE since the current server went 
> down after 4-500 blackberries ate up all the (limited) capabilities of 
> that machine.    Perhaps I am looking in the wrong place, the point is 
> the demand I am facing is to have IMAP that essentially behaves as a 
> POP3 client when it comes to inbox scans.
>
> I believe there was an issue as well where POP clients using outlook 
> would cause mailbox corruption when they popped a mailbox being 
> maintained by a blackberry connected via IMAP.
>
> R.
>
>
> ----
> Cyrus Home Page: http://www.cyrusimap.org/
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