[imp] Sort by arrival problem

[Pallos B. Richard]

Hi All,

I got a problem after migrating Maildirs from an older server to a new one.

The problem is that IMP does not sort correctly the messages in the 
Maildir by the arrival index (desc: 3,2,1 OK, but asc:2,1,3 not OK!). It 
seems that the migrated letters do not get sorted at all.
The Maildir was migrated with a simple file-system copy. Other IMAP mail 
clients (mozilla, thunderbird) work fine.

 From the imp/lib/Mailbox.php I found out that the sort is made by the 
PHP's imap_sort() builtin function so I checked the sort index. I got, 
that for the migrated old messages the message_id row in the array is empty.

e.g.:
New letter: [message_id] => <20050720154309.61A8620937 at hostname>
Migrated  : [message_id] =>

Is the imap_fetch_overview() gets this message_id wrong? Is it a 
c-client problem? Is it possible to sort by the [msgno] instead?

thanks,
Richie

params:
migration: debian woody -> sarge
IMAP: courier-IMAP 1.4.3-2.5 -> 3.0.8-4 (deb package)
PHP 4.3.10-15 (deb package)
IMP 4.0.2, Horde 3.0.3 (src)