tcpserver: fatal: unable to bind: address already used

A problem arised one day, I cannot see my smtp server!
Checked on the error of qmail and checked the net for a fix
 Problem

tcpserver: fatal: unable to bind: address already used
tcpserver: fatal: unable to bind: address already used
another process is using port 25 

 netstat -anp |grep LIST
 service exim stop

then used this command so that it wont run again mv /usr/sbin/exim /usr/sbin/exim.old

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