dovecot - May 2011 - IMAP message ID bad for very old message

Hi,

   I just noticed that the ordering by message ID when accessing my  
email via IMAP is messed up. I'm looking in the INBOX that contains  
11757 emails. For some reason a load of emails from 2009 and 2010 are  
being listed near the top, for example I have a message with ID 11441  
from 2009 where it definitely shouldn't be, its all mixed in with  
emails from 2011 there.
Info from LDAP is:

* 11441 FETCH (FLAGS (\Answered \Seen) INTERNALDATE "27-Mar-2009  
09:14:10 +0000" RFC822.SIZE 5772 ENVELOPE ("Fri, 27 Mar 2009 09:15:09
-0000" "MyC IP on CBL" (("Patrick XXXXXXXX- XXXXXXXX"
NIL "patrick"
"XXXXXXXX.co.uk")) (("Patrick XXXXXX- XXXXXXXX" NIL
"patrick"
"XXXXXXX.co.uk")) (("Patrick xxxxxx - xxxxxxx" NIL
"patrick"
"XXXXXXXX.co.uk")) (("Andy Smith" NIL "a.smith"
"ukgrid.net"))
(("Frank XXXXXXX" NIL "frank"
"XXXXXXXXXXX.co.uk")(NIL NIL
"Tim.XXXXXXXX" "XXXXXX.org")) NIL NIL  
"<6937D025FA924E73B8C839858C27AEBF at PatrickDesktop>"))


I'm using maildir format, and the actual file date looks fine too:

-rw-rw----  1 vmail  vmail  5627 Mar 27  2009  
1238145250.H86871P67126.mx1.ukgrid.net:2,RS

I am testing IMAP via telnet (originally noticed the problem viewing  
mail via HORDE/IMP). My system is FreeBSD 8.2, Dovecot 2.0.11.
What might cause this behaviour?

thanks Andy.

Quoting a.smith at ukgrid.net:
> Hi,
>
>   I just noticed that the ordering by message ID when accessing my  
> email via IMAP is messed up. I'm looking in the INBOX that contains  
> 11757 emails. For some reason a load of emails from 2009 and 2010  
> are being listed near the top, for example I have a message with ID  
> 11441 from 2009 where it definitely shouldn't be, its all mixed in  
> with emails from 2011 there.
> Info from LDAP is:
>
> * 11441 FETCH (FLAGS (\Answered \Seen) INTERNALDATE "27-Mar-2009  
> 09:14:10 +0000" RFC822.SIZE 5772 ENVELOPE ("Fri, 27 Mar 2009  
> 09:15:09 -0000" "MyC IP on CBL" (("Patrick XXXXXXXX-
XXXXXXXX" NIL
> "patrick" "XXXXXXXX.co.uk")) (("Patrick XXXXXX-
XXXXXXXX" NIL
> "patrick" "XXXXXXX.co.uk")) (("Patrick xxxxxx -
xxxxxxx" NIL
> "patrick" "XXXXXXXX.co.uk")) (("Andy Smith"
NIL "a.smith"
> "ukgrid.net")) (("Frank XXXXXXX" NIL "frank"
> "XXXXXXXXXXX.co.uk")(NIL NIL "Tim.XXXXXXXX"
"XXXXXX.org")) NIL NIL
> "<6937D025FA924E73B8C839858C27AEBF at PatrickDesktop>"))
>
>
> I'm using maildir format, and the actual file date looks fine too:
>
> -rw-rw----  1 vmail  vmail  5627 Mar 27  2009  
> 1238145250.H86871P67126.mx1.ukgrid.net:2,RS
>
> I am testing IMAP via telnet (originally noticed the problem viewing  
> mail via HORDE/IMP). My system is FreeBSD 8.2, Dovecot 2.0.11.
> What might cause this behaviour?
>
> thanks Andy.
>
Ok, I just deleted the dovecot index files etc from the mailbox, when  
it recreated them all is now looking normal...

ta Andy.

Quoting a.smith at ukgrid.net:
>
> Ok, I just deleted the dovecot index files etc from the mailbox,  
> when it recreated them all is now looking normal...
>
When I logged into my mail today this problem has come back :S Can  
anyone suggest a cause or anything else I should do?
I am correct in thinking that Dovecot normally orders emails by date right????

thanks Andy.