Cyrus + postfix virtual mailboxes

[Hamish]

Hello everyone
Could someone please point me in the right direction? I would like to 
use virtual mailboxes for users. Username, pass, aliases etc are stored 
in ldap and I would like to be able to just use this to store user 
information. I have seen ways to do this with virtual domains, but I 
dont need this for now, only virtual mailboxes with postfix.
Is this possible? Are there any howtos or docs on this?
Thanks,
H
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