Making an e-mail alias means making an email that shares the exact same mailbox as a different e-mail address for both the inbound as well as the outgoing email messages. For example, you can create an e-mail address email@example.com and it'll be connected to its very own mailbox. After that, you can make an alias firstname.lastname@example.org, that can use the mailbox of sales@ and will not have a mailbox of its own. Every time you check your email messages, you will see messages sent to either one of the two addresses in a single place, which may be far more convenient in some cases because you will not need to sign in and out of different mailboxes working with webmail or set up numerous email addresses inside an email program. This feature is commonly used as an alternative choice to forwarding e-mail messages from a single e-mail address to a new one if a number of addresses are included for contact on a site.