Dynamically set LDAP user namespace using two attributes

Hi,

I’m looking for a way to use two LDAP attributes to create a user-specific namespace to be expunged e.g.

mailExpungeTrash=namespace/inbox/mailbox/%{ldap:mailTrashMailbox}/autoexpunge

I can create the namespace fine returning the full string to be expunged:

mailExpungeTrash=namespace/inbox/mailbox/Deleted\_Messages/autoexpunge

However I want to alter the namespace using a second LDAP attribute like:

mailExpungeTrash=namespace/inbox/mailbox/%{ldap:mailTrashMailbox}/autoexpunge

Regards Thomas