Rejecting mail

A client I support may be effected if the fed shuts down this weekend. I
don't want to get into the politics of the matter but if it does shutdown I
need to set their in coming mail relay so that it rejects incoming mail with
a bounce rather then just shutting it down and letting the mail spool on the
sending server. I know how to do this with sendmail but alas the relay is
running postfix.

The bottom line is I want this mail relay to reject all mail both inbound or
outbound with an error code so the mail doesn't spool. Does anyone know how I
would go about this or know of a link with the information on how to do it?

Frank
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