An e-mail alias is an e-mail address that shares a mailbox with a different email. For instance, you can have info@domain.com and also support@domain.com and messages sent to either one of them will be received in one mailbox. This option will make it easier and much more convenient to control a lot of e-mail addresses as you will need to log into one mailbox if you work with webmail as well as create only one e-mail address in a email client on your desktop. If you set up an alias, you won't just have the ability to get e-mails, but you will also be able to send e-mails from the various addresses and they'll share the Outbox, so you will still have all communication in one place. Using aliases is a replacement for making use of different email addresses for a variety of purposes or forwarding one e-mail address to a new one in order to manage the emails of both in a single location.