On 28.12.2009, at 8.30, Florian Effenberger wrote:
According to http://kb.mozillazine.org/Checking_for_new_messages_in_other_folders_-_Thund... it should be sufficient to enable one setting -- given that the IMAP server returns the STATUS command correctly. I still run Dovecot 1.0 (from Debian 4.0), and it seems this version doesn't support the IMAP STATUS command, as I have to explictly query each folder with the second mentioned setting.
Which v1.0? (Which one's Debian 4.0? :) I wish Debian used Ubuntu-style year+month numbers as versions. The only Debian versions I remember are stable, testing and unstable..)
Anyway, I don't think there have been any actual STATUS command related bugs in Dovecot. If opening the mailbox shows that there are new mails, it's more likely that it's a Thunderbird bug/configuration issue.
Or does Dovecot even offer an option like the mentioned IMAP_CHECK_ALL_FOLDERS=1
A quick google lookup didn't really tell what this does. My best guess is that it sets \Marked flag for LIST replies, which Dovecot does by default and Thunderbird completely ignores.
and IMAP_ENHANCEDIDLE=1 in Courier?
This is done by default, if compiled with dnotify/inotify (dovecot --build-options shows). But it's not related to your problem anyway.