Deny messages to local mailing lists

10 msg	postfix relaying
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Deny messages to local mailing lists
\ Alejandro Cabrera Obed (16 May 2007)
. \ Noel Jones (16 May 2007)

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Subject:	Deny messages to local mailing lists
Group:	Postfix-users
From:	Alejandro Cabrera Obed
Date:	16 May 2007

Dear all, I have a Postfix mail server for @domain.com with one alias
mailing list as follow:

all: john peter mary ........

so all is a local mailing list.

I need to deny messages from Internet getting the all account
because is a spam entry.

Where can I setu up this rule in postfix ???

Thanks a lot

Alejandro