[horde] Unique userid@domain

[Sven Wilhelm]

Hello,

how can you handle a really uniqe userid in horde2.0.

Problem:
We have a mail-server for every business-unit (the domain-part is
business-unit.domain.de) and our uniq user-ids are user at business-unit.

In the old imp-database-scheme (imp2.2) this was no problem, because the
user-id was user at domain, but in the new horde2.0 the user-id contains no
domain part an so example at mail1.danet.de has the same profile as the
example at mail2.danet.de.

Is there a way to keep it unique?

Greetings

Sven Wilhelm