An email alias is an email that uses exactly the same mailbox along with the primary e-mail address. For example, you could have [email protected] as the authentic address and add an alias [email protected] The 2 addresses will be able to share the very same mailbox, so emails sent to either one of them will be received in a single place. You can use aliases for various purposes, for example talking with various types of people or registering on sites. For those who start getting a lot of spam, for instance, you can simply eliminate the alias whilst your actual mailbox won't be changed in the least and you'll retain the emails that you need. Aliases are often regarded as a replacement for forwarding e-mails from one email address to another one if you use 2 or more addresses for contact on your website.