Alias Domain Name Space conflicting with dynamic search base in postfix config

[Timotheus Pokorra]

Hello,

I am currently working on users that have an alias domain.
Eg. domain alias my-example.org for primary domain myexample.org

Receiving the emails to the alias works fine when the postfix files 
contain the hardcoded primary domain:
search_base = dc=myexample,dc=org

But following 
http://docs.kolab.org/administrator-guide/configuring-the-kolab-server.html?highlight=search_base#configuration-considerations-for-multiple-domain-namespaces
I have now search_base = dc=%2,dc=%1

But now the email to test at my-example.org is not delivered anymore, and 
the error is:
status=bounced (unknown user: "test")
I guess the domain my-example.org is searched, and not myexample.org 
which would have an alias for test at my-example.org

Is there an easy fix for this?

Thanks,
   Timotheus