An e-mail alias is actually an e-mail address that shares a mailbox with a different email. For instance, you could have and and emails sent to either one of them will be received in a single mailbox. This feature will make it less complicated and much more convenient to handle various email addresses as you will have to log into just one mailbox if you work with webmail or configure one e-mail address in a e-mail app on your desktop. If you create an alias, not only will you have the ability to get messages, but you'll also be able to send email messages from the different addresses and they'll share the Outbox, so you'll still have all communication in a single place. Using aliases is a replacement for making use of different email addresses for various purposes or forwarding one e mail address to a different one in order to handle the communication of both in a single location.