[Dovecot] 1.0 beta3 not preserving X-Keyword header?

[Gregory K. Ruiz-Ade]

We've been putting 1.0 Beta 3 through the paces on our test system, and one 
of our users pointed out to me that Thunderbird's "labels" behave strangely 
on the new server.  In fact, there used to be a header added to the message 
via IMAP when Thunderbird placed a label on a message, but as of the switch 
from 0.99.11 to 1.0beta3, this label header is no longer placed in the message.

Specifically, Thunderbird adds the "X-Keyword: $LabelN" header when you add 
a label to the message in tbird, where "N" is [1-9].  This works on dovecot 
0.99.11 (RHEL4), but not on 1.0beta3.  1.0b3 doesn't seem to add this header 
at all, but rather seems to keep this information somewhere else.  Perhaps 
in the .imap indexes?

We're using mbox stores on the server.  This was tested with both 
Thunderbird 1.0.7 (most widely deployed) and Thunderbird 1.5.

Aditionally, we've found that if the .imap index directories are removed, 
all the Thunderbird labels on messages seem to get "confused", too.  I.e., 
if the user uses multiple machines throughout the day, changes in one client 
may not be reflected in another, when the user moves to a different system.

I'm still trying to get more details from the users, but have been doing 
preliminary testing that verifies this.  One of the users complaining about 
this is my manager, who makes extensive use of Thunderbird's "Label" 
feature, so he's a bit nervous. :\

Another thing we've noticed is the potential for bad behavior if a use 
switches from the old dovecot to the new dovecot, which seems to be resolved 
if the .imap indexes are removed...

Let me know what other information is needed, and I'll do my best to collect it.

Gregory

-- 
Gregory K. Ruiz-Ade
Sr. Systems Administrator
Computer Science and Engineering
University of California, San Diego
Office: EBU3b 1216
Phone:  (858) 822-2625
E-mail: gkra at ucsd.edu