Making an e-mail alias means setting up an e-mail that shares the exact same mailbox with a totally different e-mail address for both the incoming as well as the outgoing messages. For instance, you can make an e-mail address email@example.com and it will be associated with its very own mailbox. Then, 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. If you look at your emails, you'll see e-mails sent to both of the two addresses in one location, which can be far more convenient in some circumstances since you will not need to log in and out of various email addresses working with webmail or create numerous addresses inside an email application. This feature is frequently used as a replacement for forwarding email messages from a single e-mail address to a different one if a number of addresses are included for contact on a site.