Answer / amsin21

Sendmail should be installed by default when you install Red
Hat Linux. If it is not then you need to install the
Sendmail RPM's with the Red Hat distribution.

Configuring Sendmail
--------------------

1) Edit file "/etc/mail/sendmail.mc" - Look for the line:

DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')

Change this line to:

dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')

Save the file.

2)Make the sendmail configuration file:

# m4 /etc/mail/sendmail.mc > /etc/sendmail.cf

3)Restart Sendmail:

# /etc/rc.d/init.d/sendmail restart

Answer / balvinder singh rawat

to add to the above answer

install sendmail-cf rpm

after installing it

just run service sendmail restart after any changes to
sendmail.mc

Answer / manoj

above answer is true but one last step is missing
#sendmail -d0 < /dev/null
#service sendmail restart
#chkconfig sendmail on

linux file defaults permition

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