Username different from mailbox

[Patrick Kranz]

Hi list,

I hope my question hasn't been answered before but I wasn't able to find 
a solution.
I have successfully installed a Cyrus Server with an OpenLDAP-Backend 
for authentication via SASL. Mail is delivered to the rest of the world 
through Postfix. Every user is able to authenticate himself with his 
email-address as username and a password. For over a half year this has 
been working really, really great.

Now I have a customer, who needs the scenario that the usernames for 
Cyrus differ from the mailbox and mailaddress respectivly. For example 
user1 at testdomain.com should be able to login with the username 
someOtherUsername. This need arises from an integration with other 
software-packages. Is there any possibility to make this work?

I appreciate every help.

Greetings,
patrick

-- 
Epper & Kranz GbR
Oliver Epper, Patrick Kranz
EK IT-Solutions
Südring 37
54634 Bitburg
Tel: +49 (0)6561 951614
Fax: +49 (0)6561 12425