[Dovecot] Thunderbird or Dovecot causing duplicates

[Timo Sirainen]

On Thu, 2011-06-23 at 11:39 +1000, Tim wrote:
> Basically, I read an email (so it gets marked as read) and then very
> quickly I mark is as unread, (i.e. I realised I want to leave that
> email for later) which causes a duplicate email to be created.
..
> Jun 23 09:23:24 tahn dovecot: IMAP(tim): Fixed a duplicate:
> /home/tim/Maildir/cur/1308696708.M863172P16126.tahn,S=3761,W=3888:2,S
> -> 1308792204.M626641P1992.tahn

Yeah, Dovecot creates a duplicate. Are you using some weird filesystem
that doesn't support atomic renames?