firewall outgoing mail

From: elie <mazzawi@xxxxxxxxx>
Date: Mon, 29 Sep 2008 15:42:26 -0700 (PDT)

is it possible to add a fire wall that will stop a server from sending
any outgoing mail,
I'm having spam problems with my server, ( it is sending spam) i want
to stop it from sending any mail at all.

I'm guessing that mail is sent to a fixed port number on other
servers, so can i make a firewall to stop programs from sending data
to a port on any remote server.
.

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