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Configure default MTA on Red Hat Enterprise Linux

1.  Install postfix
# yum install postfix
2.  Stop and Disable sendmail (if running)
# service sendmail stop
# chkconfig sendmail off
3.  Enable and start postfix
# chkconfig postfix on
# service postfix start
4.  Update postfix config with correct relay host
# postconf -e relayhost=yoursmtphost.com

5.  Make postfix the default MTA

# alternatives –config mta

There are 2 programs which provide 'mta'.

  Selection    Command

-----------------------------------------------

*+ 1           /usr/sbin/sendmail.sendmail

      2           /usr/sbin/sendmail.postfix

Enter to keep the current selection[+], or type selection number: 2


5.  Test mail relay
# echo TEST | mail -s TEST youremail@yoursmtphost.com

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