Distribution List doesn't work -> Mailbox unknown

[Marcel Thoms]

Hey List,

well I'm right now using a Kolab server and some thing that I can't get to 
work are the distribution lists.

I configured one list list at haacon.de and added myself as recipient. the mail 
arrives successfully but the sender also gets bounced with the message:

-->
Final-Recipient: rfc822; list at haacon.de
Original-Recipient: rfc822;list at haacon.de
Action: failed
Status: 5.3.0
Diagnostic-Code: x-unix; Failed to set recipient: Mailbox unknown.  Either
    there is no mailbox associated with this name or you do not have
    authorization to see it. 5.1.1 User unknown, code 550
<--

even the standard lists like abuse or postmaster doesn't work!

what i've encountered so far that postfix is looking for the distlist and 
sends mail to the members but also looks for the list in accounts (which of 
course doesn't exist) and fails.

the /var/log/kolab/resmgr.log tells something similar:

April 22 11:46:03 kolabmailboxfilter.php[1152]: Debug: Kolabmailboxfilter 
starting up, sender=user at haacon.de, recipients=user3 at haacon.de, 
client_address=10.10.21.98
April 22 11:46:03 kolabmailboxfilter.php[1153]: Debug: Kolabmailboxfilter 
starting up, sender=user at haacon.de, recipients=user2 at haacon.de, 
client_address=10.10.21.98
April 22 11:46:03 kolabmailboxfilter.php[1150]: Debug: Kolabmailboxfilter 
starting up, sender=user at haacon.de, recipients=list at haacon.de, 
client_address=10.10.21.98
April 22 11:46:03 kolabmailboxfilter.php[1150]: Error: Failed to set recipient 
list at haacon.de: Mailbox unknown.  Either there is no mailbox associated with 
this
name or you do not have authorization to see it.
5.1.1 User unknown, code=550

the corresponding entries in the main.cf of postfix:
virtual_maps = ldap:/etc/postfix/kolab-ldapdistlist.cf,
        ldap:/etc/postfix/kolab-ldapvirtual.cf
local_recipient_maps = $virtual_alias_maps, $virtual_mailbox_maps, 
$virtual_maps, $alias_maps
mailbox_transport = kolabmailboxfilter

i would appreciate any help, i really tried everything with the postfix 
main.cf but nothing changed...

thanks, marcel
-- 
Marcel Thoms
Abteilung ITN

Telefon  +49 (0) 9375-84 319
Telefax  +49 (0) 9375-84 312
Internet http://www.haacon.com

haacon hebetechnik gmbh | Josef-Haamann-Str.6 | D-97896 Freudenberg
Amtsgericht Aschaffenburg HRB 2121
USt-IdNr. DE 132086227
Steuernummer 204/115/60687

Geschäftsführer: Thomas Lotz (Vors.), Michael Grän