email filtering with parked domains

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http://forums.cpanel.net – Hi, I have some accounts with parked accounts. To prevent spam I would like to enable some email addresses (info@.., sales@.., admin@..., support@...) and block all others (at SMTP time). I would like these 3 email addresses to come into 1 email box. I could use a catch-all with account level filtering wich works pretty good. The only downside of this is that I can only choose to discard the message or to `fail with message`, but that last one sends a new email to the sender and I would like the mail to be blocked at stmp time. Since there are a lot of parked domains, its a lot of ()