Existing Mail List bouncing after upgrade to 0.9.0

==== Required information ====
- iRedMail version:
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):
- Linux/BSD distribution name and version:
- Related log if you're reporting an issue:
======== Required information ====
- iRedMail version:
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):
- Linux/BSD distribution name and version:
- Related log if you're reporting an issue:
======== Required information ====
- iRedMail version: 0.9.0
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Linux/BSD distribution name and version: Debian Wheezy
- Related log if you're reporting an issue:
====

Hello,

after upgrading to 0.9.0 the existing mail lists are bouncing:

mail postfix/pipe: 065BE4001428: to=<maillist@example.org>, relay=dovecot, delay=0.09, delays=0.01/0.02/0/0.06, dsn=5.1.1, status=bounced (user unknown)

I've undone the improper Postfix settings in both main.cf and master.cf mentioned here http://www.iredmail.org/docs/upgrade.ir … 0.9.0.html and reviewed the settings but now i'd guess i need a little help ...

Thanks for help