Making an email alias means setting up an e-mail address that shares the very same mailbox with a completely different address for both the inbound and the outbound emails. For example, you can create an email address email@example.com and it'll be connected to its own mailbox. After that, you can create an alias firstname.lastname@example.org, which can make use of the mailbox of sales@ and will not have a mailbox of its own. Every time you look at your email messages, you'll see email messages sent to both of the two addresses in one location, which might be far more convenient in some instances because you will not have to sign in and out of different email addresses working with webmail or set up many addresses inside an email program. This option can be used as a replacement for forwarding email messages from a single address to a different one if multiple addresses are mentioned for contact on a website.