How do block telnet to port 25

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Hello ,
 
Can anybody tell me how do i block telnet to port 25 form my local users with the help of iptables can u tell me the rule
see I have two network card on that machine
eth0 is internet card and eth1 is local card
192.168.0.1 is my gateway IP
 
like root# telnet www.mydomain.com 25
 
Thanks in advance


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