Reliable Penguin

wget ftp://ftp.sendmail.org/pub/sendmail/sendmail.8.12.11.tar.gz
tar -xvzf sendmail.8.12.11.tar.gz
cd sendmail-8.12.11/
cd sendmail
sh Build
cd ../cf/cf
cp /etc/mail/sendmail.mc  .
sh Build sendmail.cf

cp /etc/mail/sendmail.mc /etc/mail/sendmail.mc.bak
cp /etc/mail/sendmail.cf /etc/mail/sendmail.cf.bak

sh Build install-cf

cp /usr/sbin/sendmail.sendmail /usr/sbin/sendmail.sendmail.bak

cd ../../sendmail
mkdir /usr/man/man1
mkdir /usr/man/man5
mkdir /usr/man/man8
sh Build install

service sendmail stop
cp /usr/sbin/sendmail /usr/sbin/sendmail.sendmail
service sendmail start
rm /usr/sbin/sendmail
ln -s /etc/alternatives/mta /usr/sbin/sendmail