postfix domains alias

[alxgomz]

Hy all!

I have a working setup of postfix with virtual domains and domain alias. Until now everything was stored in flat files (hash lookups) and I recently moved to an LDAP backend where I store my virtual domains, mailboxes and local aliases. I would like use LDAP for domains aliases too, meaning that every existing address in a "main" domain (eg: user1@domain.com) should be redirected to the same localpart in the alias domain (eg user1@domain.net).
With Flat files I acheived this behaviour by using "virtual_alias_domains = hash:/myfile/with/alias_maps"

and /myfile/with/alias_maps was something like:
@domain.com @domain.net

Does anybody knows how to make it work with LDAP (or even mysql would maybe help me)