When you setup DirectAdmin, notification messages are by default sent to root@host.server.com.  For most people this would not be practical.

To easily modify where all messages to root are sent, the easiest is to create a .forward file for the root user.

Execute the following command and messages to root@host.server.com will automatically be forwarded to your actual email address and hey, you might actually get them that way.

echo "your@email.com" > /root/.forward

In addition to that, you need to ensure the permissions are correct on the .forward file. If you are running Exim, it is really picky about the security level on the files by default.

I found this works:

chmod 0600 .forward