All customer who have their own domain name and a web hosting package can have email addresses set up with that domain name, for example firstname.lastname@example.org. Before the @ symbol you can have virtually any prefix you like as long as it doesn't contain any unusual characters.
Webmail is an online service that enables you to manage and respond to your emails on the web, hence the name 'webmail'. There is a separate webmail service for each email address that you create via the Control Panel. Webmail can be accessed from the Control Panel.
Due to the change in hosting provider this page is pending updates.