An e-mail alias is an e-mail that uses exactly the same mailbox as the primary email. For example, you can have [email protected] as the original email address and add an alias [email protected] Both the addresses can share the very same mailbox, so emails sent to both of them shall be received in one place. Feel free to use aliases for various purposes, for example talking with various groups of people or enrolling on web sites. Any time you start getting a number of spam, for instance, you can easily eliminate the alias while your original mailbox will not be impacted in the slightest and you will retain the communication you need. Aliases are often viewed as a replacement for forwarding messages from one mailbox to another if you work with a couple of addresses for contact on your site.