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From: Simon Josefsson <simon@josefsson.org>
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Subject: Re: (provide 'nnmaildir)
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Original-To: prj@po.cwru.edu (Paul Jarc)
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prj@po.cwru.edu (Paul Jarc) writes:

> > Can you envision what changes to the Gnus backend interface would be
> > necessary to allow nnimap/maildir's huge message IDs with huge gaps to
> > work okay?
> 
> IIUC, no interface changes would be necessary.  The nnimap backend
> would just use a different method of generating article numbers: do
> its own sequence instead of using the numbers coming from the IMAP
> server.

But it need to use the server's sequence number to be able to fetch a
article, find out what flags the article got, search for articles and
stuff.  It's not up to nnimap to decide what article number a article
got, that's server assigned.

It might translate back and forth between Gnus-article# and
IMAP-article# but that would be really slow, and the whole point of
having state in the server is lost.