Creating an email alias means creating an email address which shares the exact same mailbox with a completely different e-mail address for both the inbound and the outgoing e-mail messages. For example, you are able to make an address email@example.com and it will be connected to its own mailbox. Then, you can make an alias firstname.lastname@example.org, that will use the mailbox of sales@ and will not have a mailbox of its own. If you check your e-mails, you will see e-mail messages sent to either one of the two addresses in a single place, which can be more convenient in some instances as you will not need to log in and out of various mailboxes working with webmail or configure multiple addresses in an email program. This feature is often used as a replacement for forwarding emails from one address to a different one if multiple addresses are listed for contact on a website.