An e-mail alias is an e-mail address that uses exactly the same mailbox along with the initial e-mail. For example, you can have email@example.com as the actual email address and create an alias firstname.lastname@example.org. Each of the email addresses will be able to share the very same mailbox, so e-mails sent to both of them will be received in one place. You can use aliases for various purposes, for example communicating with various types of people or registering on websites. Any time you begin to get a number of spam, for instance, you can easily get rid of the alias whilst your actual mailbox won't be affected in any way and you will retain the e-mails that you need. Aliases are often viewed as a substitute for forwarding messages from one email address to a different one if you use 2 or more addresses for contact on your website.