I'm testing my email, but I don't receive any back. I'm not receiving the test emails I am sending myself.

If you're not receiving email, the first thing to check is if you set up the email account, user and password. Then, make sure that when you login to yourdomain/webmail that you enter the exact email address as the user and the password you choose during setup.

If you use your admin panel username and password, you may not be logged in to the correct account.

Explanation:
You have received your email test messages, they are in the webmail interface that matches the email address you sent the message to. That's the email address and password you have to use. 

If you logged in to another email account, such as your default email address, the messages you sent to one won't be viewable by another email unless you forwarded them.

The last thing to check if you are not receiving email from Outlook Express, or one of the other popular desktop clients, are the mail settings. Check to see if you mistyped the setting or password.