An email alias is actually an email that shares a mailbox with a completely different e-mail address. For example, you could have firstname.lastname@example.org and email@example.com and emails sent to either one of them will be received in just one mailbox. This option will make it less complicated and much more convenient to handle various addresses since you will need to log into one single mailbox if you are using webmail or set up just one address in a email application on your PC. When you create an alias, you will not only have the ability to get emails, but you will also be able to send emails from the various addresses and they'll share the Outbox, so you'll have all communication in one location. Using aliases is surely a substitute for using different e-mail addresses for different purposes or forwarding a single address to a new one so that you can handle the e-mails of both in a single place.