# yum install -y exim

To assist in testing the mail configuration

# yum install -y mailx

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

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