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From: Vegard Vesterheim <vegard.vesterheim@uninett.no>
Newsgroups: gmane.emacs.gnus.general
Subject: Re: Searching in IMAP groups doesn't work
Date: Fri, 02 Oct 2009 12:08:59 +0200
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To: "Sven Bretfeld" <sven.bretfeld@gmx.ch>
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On 2 Oct 2009 11:11:00 +0200 "Sven Bretfeld" <sven.bretfeld@gmx.ch> wrote:

> Vegard Vesterheim <vegard.vesterheim@uninett.no> writes:

>> You must mark groups first. 
>>
>> (gnus-group-mark-group, gnus-topic-mark-topic) 
>
> That brings me a step further, thanks. But it's still not working. I
> marked two or three groups and searched for some common strings that are
> included in more than one Mail in those groups. But the result is
> always:
>
> `Couldn't request groups. Search produced empty results.'
> This message turns up immediately. Gnus cannot have searched through
> anything. Do I first have to prepare an index as in a mairix query or
> something? 

I assume that you are using the 'imap' nnir engine (C-h v
nnir-search-engine).  You do not need to prepare an index, you are
doing a native IMAP SEARCH on your IMAP server.

If you are using IMAP search, have a look in the buffer named
'*imap-log*', you may find some clues there.

 - Vegard V -