Making an email alias means creating an email address which shares the same mailbox with a totally different address for both the inbound and the outbound e-mails. For example, you’re able to make an e-mail address sales@domain.com and it will be connected to a unique mailbox. Next, you can create an alias support@domain.com, that can use the mailbox of sales@ and does not use a mailbox of its own. If you check your emails, you'll see messages sent to either one of the two addresses in one location, which may be more convenient in some instances as you will not have to sign in and out of different email addresses working with webmail or configure many email addresses in an email app. This feature is normally used as an alternative choice to forwarding messages from one e-mail address to another one if numerous email addresses are included for contact on a website.