In this tutorial, you will learn how to find out why mail cannot be sent to a particular e-mail address. You'll also see how to look up the MX (mail exchange) records for a valid e-mail address.
1) Locate the Email category.

2) Go to Mail Troubleshooter.

3) Enter an e-mail address on which to perform a trace. For testing purposes, we'll enter one that should definitely not exist.

4) Click Submit.
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When attempting to perform an MX lookup for the domain name, no information about the host could be found.

5) Return the the troubleshooter.
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6) Now let's try a valid e-mail address.

7) Submit the form.
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As you can see, an individual graphic will display for every mailserver on record for the domain name.

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This is the end of the tutorial. You now know how to use the Mail Troubleshooter in WHM.