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From: Simon Josefsson <jas@extundo.com>
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Subject: Re: lost uidvalidity
Date: Wed, 26 Jan 2005 14:02:00 +0100
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Sébastien Kirche <sebastien.kirche.no@spam.free.fr.invalid> writes:

> Hi,
>
> while doing some experiment with group parameters on an nnimap group, i have
> lost the uidvalidity value.
>
> Now Gnus keeps on getting all headers every time i enter the group. 
>
> How to generate a new one ?

It is generated automatically, and in any case shouldn't affect
getting all headers.  Perhaps you changed some other customization?