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From: Simon Josefsson <simon@josefsson.org>
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Subject: Re: nnml -> nnimap (preserving Xrefs)
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Sean Doran <smd@ebone.net> writes:

>    First problem: it took a bit to realize I needed the
>                   "my-imap-splitter" function to avoid
>                   EVERYTHING being crossposted into "misc"
>                   (instead of just new mail being moved there)
>                   I (naively) did "mv misc INBOX" + M-g
>                   and now there are *lots* of duplicates
>                   in each group.   How do I get rid of them?

I don't think there's any built-in functionality for doing that.  You
could write a function that iterate over `gnus-newsgroup-headers',
comparing msgid's and process marking some of them.

Perhaps it would be useful to include it in Gnus -- i.e. "Process Mark
all Duplicate Articles".

>    Second problem: How does anything know that the
>                    the nnimap-split-rule crossposted an
>                    article?  That is, how do I get marks
>                    to propagate to all the groups an
>                    nnimap article is crossposted into?

It doesn't.  IMAP doesn't support the concept of cross-posting.  Right
now, the article is simply copied into all mailboxes.  And until more
servers support the ANNOTATE draft, there's no way we can attach any
(such as a Xref header) information on the article.