[imp] New Mail notification latency

[Claude Tompers]

On 06/01/2012 11:09 AM, Michael M Slusarz wrote:
> Quoting Claude Tompers <claude.tompers at restena.lu>:
>
>> Hi,
>>
>> I have a user with quite a large mail box (about 200 messages in the
>> inbox and a gazillion folders).
>> If he enables new mail notifications, it takes him about a minute to get
>> it's inbox displayed.
>> Is this normal behaviour because the system scans all folders or should
>> it be faster ?
>
> If he has a "gazillion" folders, and he is checking each one for
> newmail, than yes... this is expected.  From RFC 3501 [6.3.10]:
>
>       Unlike the LIST command, the STATUS command is not guaranteed to
>       be fast in its response.  Under certain circumstances, it can be
>       quite slow.  In some implementations, the server is obliged to
>       open the mailbox read-only internally to obtain certain status
>       information...
>
>            The STATUS command MUST NOT be used as a "check for new
>            messages in the selected mailbox" operation (refer to
>            sections 7, 7.3.1, and 7.3.2 for more information about
>            the proper method for new message checking).
>
>            Because the STATUS command is not guaranteed to be fast
>            in its results, clients SHOULD NOT expect to be able to
>            issue many consecutive STATUS commands and obtain
>            reasonable performance.
>
> Despite this warning, this is EXACTLY what everybody uses STATUS for. 
> So recent IMAP extensions have directly addressed this issue.  You
> should upgrade to an IMAP server that supports LIST-STATUS (and/or
> mailbox stat caching) if you want to see much improved behavior.  Or,
> the better solution, is to disable the option to allow a user to poll
> all mailboxes.  THIS IS A TERRIBLE IDEA AND IS ALMOST CERTAINLY NOT
> WHAT THE USER WANTS.  NO USER SHOULD BE POLLING *ALL* THEIR MAILBOXES.
>
> michael
>
> ___________________________________
> Michael Slusarz [slusarz at horde.org]
>
Hi,

Thanks very much for your explanations.

kind regards,
Claude

-- 
Claude Tompers
Ingénieur réseau et système
Fondation RESTENA - Réseau Téléinformatique de l'Education Nationale et de la Recherche
6, rue Richard Coudenhove-Kalergi
L-1359 Luxembourg

Tel: +352 424409 1
Fax: +352 422473


-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 262 bytes
Desc: OpenPGP digital signature
URL: <http://lists.horde.org/archives/imp/attachments/20120601/5e3713d3/attachment.bin>