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FYI,
Create new virtual server, enable mail, add email accounts. Then - dissable email in server options. Setup MX outside. If the local virtual web server sends email to virtual accounts - mail delivered localy. /etc/postfix/virtual.db still have route to dissabled local virtual email clients. You must delete those lines and run - postmap /etc/postfix/virtual to update db.
P.S. On deb etch 4.