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From: Simon Josefsson <jas@extundo.com>
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Subject: Re: nnimap: Checking mailbox foo
Date: Tue, 28 Aug 2001 10:54:43 +0200 (CEST)
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On Tue, 28 Aug 2001, Kai Großjohann wrote:

> > It might be possible to collect this information in the background.
> > Or altering the way Gnus looks for unread mail to make things faster.
>
> This sounds as if the IMAP protocol could deliver useful information
> faster, but Gnus doesn't know what to do with it.

Yup.

> What could be the data that IMAP can deliver faster?

Most things except highest and lowest article number in the group:

      MESSAGES       The number of messages in the mailbox.

      RECENT         The number of messages with the \Recent flag set.

      UIDNEXT        The next UID value that will be assigned to a new
                     message in the mailbox.  It is guaranteed that this
                     value will not change unless new messages are added
                     to the mailbox; and that it will change when new
                     messages are added even if those new messages are
                     subsequently expunged.

      UIDVALIDITY    The unique identifier validity value of the
                     mailbox.

      UNSEEN         The number of messages which do not have the \Seen
                     flag set.