from http://oops.org
----------------------

#!/bin/sh
IPADDR=`ifocnfig ppp0 2> /dev/null | grep 'inet addr' | awk '{print $2}' 
| sed -e 's/.*://'`

MAIL="
From: from at addr.com
To: to at addr.com
Subject: 변경 IP
MIME-Version: 1.0
Content-Type: text/plain; charset="EUC-KR"
#html 메일송신시 -> Content-Type: text/html; charset=euc-kr
Content-Transfer-Encoding: 8bit

$IPADDR
"
echo ${MAIL} >> /tmp/mailtext.txt

sendmail -vt < /tmp/mailtext.txt
rm -f mailtext.txt

exit 0