An e-mail alias is an e-mail that uses the exact same mailbox along with the original email address. For instance, you can have email@example.com as the actual address and add an alias firstname.lastname@example.org. Both the addresses can share exactly the same mailbox, so messages sent to either one of them will be received in a single place. You can use aliases for various purposes, such as emailing numerous groups of people or registering on web sites. If you start getting a number of spam, for instance, you can easily get rid of the alias whilst your original mailbox won't be affected in the slightest and you'll retain the emails that you need. Aliases are often perceived as a replacement for forwarding messages from one email address to another one if you work with two or more addresses for contact on your website.