Hello,
I've just switched from UW-IMAP to Dovecot, and for the most part,
things are good.
However, I encountered the problem with the X-Keywords header not
being written back into individual messages in an mbox file
(originally described in [1], and Timo gave a clue as to maybe why in
[2]).
What was happening for me is that Apple's Mail.app would flag a
message as spam, which happily sets a couple keywords in the message,
but those weren't being written back (at least, I didn't see them in
the file on the server). The "DO NOT DELETE..." message had a
perfectly fine X-IMAP header, and up until I switched things were
working great.
The user visible symptom of this happened every time new spam
arrived in my Junk folder [3] --- the new spam would arrive, be
flagged as spam by Mail.app, and the earlier pieces of mail would
promptly be unflagged!
Anyway, Timo's clue in [2] prompted me to turn off both
mbox_lazy_writes and mbox_dirty_syncs (the latter just on the off-
chance... it's a low-volume server, so I can deal with the
inefficiency). Lo and behold, Mail.app started acting sane again
*and* the X-Keywords header appeared immediately.
Oddly, during all of this, the Status and X-UID keywords would
appear in the messages just fine; no clue as to why those and not X-
Keywords.
Version details are: - Dovecot 1.0rc13 [4] - FreeBSD 5.3-RELEASE - Apple Mail.app 2.1 (752/752.2)
cheers, --joey
[1] http://dovecot.org/list/dovecot/2006-March/011872.html
[2] http://dovecot.org/list/dovecot/2006-June/014126.html
[3] And it felt really strange while troubleshooting this as I found
myself *hoping* for another piece of spam to arrive. Bleh.
[4] Yes, two versions behind current, but in my defense, I did check
the announcements and they didn't seem to mention the problem.