Do Cyrus support virtual domain

[dwchan]

I was wondering if v1.6 or v2.0 or Cyrus support virtual domain.  If so,
do each domain must have their own unique IP?

There are few IMAP that support virtual domain by using IP alias or embed
@domain.com to the username.  I was wondering if Cyrus can do the same?
Or is it just straight IMAP like wu-ftpd!

dwc