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From: Eric Abrahamsen <eric@ericabrahamsen.net>
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Subject: Using the $Forwarded keyword in nnimap
Date: Wed, 31 Jul 2019 15:10:26 -0700
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Hey all,

I just realized that it's very easy to tie Gnus' forwarded mark to the
IMAP $Forwarded keyword, which is supported in recent versions of
Dovecot, at least (I don't know about other IMAP servers). If you think
your server supports it, this code should be enough to enable it:

(with-eval-after-load 'nnimap
  (setf (alist-get 'forward nnimap-mark-alist)
	'("$Forwarded" $Forwarded)))

Maybe everyone else already figured this out, but if not... :)