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From: Greg Troxel <gdt@work.lexort.com>
Newsgroups: gmane.emacs.gnus.general
Subject: Re: sluggish IMAP updating?
Date: Thu, 24 May 2007 08:11:13 -0400
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Simon Josefsson <simon@josefsson.org> writes:

> Greg Troxel <gdt@work.lexort.com> writes:
>
>> [gnus/dovecot doesn't notice new messages right away]
>
> Does toggling nnimap-need-unselect-to-notice-new-mail help?

Yes, that seems to fix the problem.   From *imap-log*, I can see that
STATUS was returning no new messages, but after UNSELECT, it gives the
right status.

So, is dovecot broken, or gnus?  I am not familiar enough with the IMAP
spec to know if dovecot is wrong for failing to report new mail that has
arrived on a selected mailbox since the selection.   With ACID hat on it
seems somewhat reasonable of dovecot conceptually, but not really ("SET
IMAP ISOLATION LEVEL READ COMMITTED" :-).

I realize this may be a deoptimization, but it would seem best for gnus
to UNSELECT a mailbox when the user exits from the group and the summary
buffer is destroyed.  That may let the imap free resources, and seems
like a good idle state.