Install Exim
# yum install -y exim
To assist in testing the mail configuration
# yum install -y mailx
Configure Exim
So far it looks like the default config works. And exim comes with no command line utility for configuration like dpkg-reconfigure exim4-config like debian, so if we have to modify settings, it'll get messy
Test Exim
Use a real email address below so you can see if you get the email
# Mail -v someone@gmail.com
If you wish, you may uninstall the command line mail utility after this test.
yum remove mailx