Unexistent user

[dimon at intellinetinc.com]

How can I configure Curus IMAP v 2.2 to forward all incoming mail to unexistent 
users in specific domain to specific email address.
Since v 2.2 supports virtual domains I'm not using Sendmail's virtusertable any 
more. But I'm missing this important feature :-(
In virtusertable I could do this:
@domain.com             admin at example.org

Is there similar config option in Cyrus IMAP Server?

Best regards,
Dmitry