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Arnd Kohrs <kohrs@castify.net> writes:

>     Jeremy> Now that I think about this, this is probably a major
>     Jeremy> problem with using ifile and imap together: one of the main
>     Jeremy> points using imap is not downloading the entire message
>     Jeremy> before you really want it.  I'll bet gnus only downloads the
>     Jeremy> headers for splitting.

Yes.

> First, is it not so that during splitting for moving a mail from the
> imap-inbox to the imap-destination-folder, the mail is in its
> text-entirety copied to emacs and than stored on the
> imap-destination-folder?  So there would be hardly any performance
> loss if all mails are downloaded in their text-entirety assuming
> that most(all) mails get moved anyway to another folder?

The nnimap splitter only downloads headers.  Moving the message is
done on the server.

It should be simple to use imap.el to iterate over all articles in a
mailbox and run some code on each message and then upload the result
to another mailbox.

Or use server-side filters like Sieve or Sendmail Milter.