Making an email alias means setting up an email which shares the very same mailbox as a totally different e-mail address both for the inbound as well as the outbound emails. For instance, you’re able to make an address firstname.lastname@example.org and it'll be linked to its own mailbox. Next, you can make an alias email@example.com, that will make use of the mailbox of sales@ and will not have a mailbox of its own. If you check your e-mails, you'll see emails sent to both of the two addresses in one place, which can be more convenient in some cases as you will not have to log in and out of various email addresses using webmail or set up many addresses in an email app. This feature is frequently used as a replacement for forwarding e-mail messages from one e-mail address to another if multiple email addresses are listed for contact on a website.