Before you can check your email you must first create an email address.
Create an email address:
1). Login to your control center and click on 'E-mail' under the Usernames section.
2). In the 'New Address' field type the name of the address you would like to create at yourdomain.com. Example: To create 'bob'@yourdomain.com only enter 'bob'.
3). Use the default action 'New Address'.
4). Click the 'Add' button in the lower left hand corner.
5). You have successfully created a new email address for your domain.