Email for Additional Domains
From Lunarpages Web Hosting Wiki
Q: Can additional domains receive e-mail?
A: Yes. You can create an unlimited number of email addresses for add-on domains, parked domains, and subdomains. The email addresses for these can be created in the Mail section of your site's control panel, under Add/Remove Addresses. The add-on, parked, or subdomain to create the email address in must be selected from the drop down box shown while creating a new address.