disable IMAP IDLE
proutfoo at hotmail.com
Tue Nov 23 10:01:58 EST 2010
> 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>
> > 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
> Even without IDLE, there are benefits in leaving the session open.
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 IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA ACL ACL2=UNION STARTTLS
this one is cyrus 2.4.4
* 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.
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