Freebsd local mail, disable mailbox but enable sending from php

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http://serverfault.com – and thanks ahead. My systems are FreeBSD 8/9, and i am trying to disable the local mailboxes for all users, but keeping the possibility to send outbound emails using PHP's mail command. My local mailboxes are getting full with junk mail from different places which i dont really care about. Is this possible? (HowTos)