So does anyone have postfix configured to check users against the database as described here: http://pbj.ca/postfix.html
In a sandbox system I have postfix configured as a catch all and forward to maildaemon.php and it works fine. I have been trying to learn all the finer aspects of virtual mail routing and DB querying with postfix but so far have been unsuccessful. The doc seems to be missing or assuming some things in the postfix config. If anyone has any additional details not mentioned in the above link please post.