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From: Lars Magne Ingebrigtsen <larsi@gnus.org>
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Subject: Re: can't mark old messages
Date: 16 Nov 1999 17:58:17 +0100
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Brian May <bam@silas-2.cc.monash.edu.au> writes:

> However, if I want to flag one of these 'new' messages with '*'
> or '!', Pgnus 0.98 produces an error:
> 
> Can't cache article -1
> 
> or
> 
> Can't mark negative article numbers

Yes, this is because Gnus can't mark articles with negative article
numbers.  :-)

When fetching via message-id, Gnus (often) does not know what the
article number of the fetched article is.  And since Gnus keeps track
of article marks via the article number, Gnus can't mark articles that 
it doesn't know the article number of.

-- 
(domestic pets only, the antidote for overdose, milk.)
   larsi@gnus.org * Lars Magne Ingebrigtsen