Debian 3.1: IPTables Rule

Hi Managers,

I need a quick fix for blocking e-mail going out on port 25 from certain 
addresses. Specifically, I only want the firewall to allow outbound port 
25 connections from the mail server, and block port 25 for all other 
IP's on our subnet. Let's say that the mail server is 192.168.1.111.

I'm not very IPTables literate, but if somebody could kindly provide the 
rule, I can add it to the firewall.

Thanks much,

Chris Fischer
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