An alias is another email address for your domain.
You can then have email arriving on this alias delivered to one of your mailboxes.
2. Select the domain you want to use
3. Click on Add Alias
4. Type in the name for your alias (in the example below we’re creating the email address firstname.lastname@example.org). In the “To” box, type in the name of the mailbox you want messages from this email address delivered to. If the mailbox is on a different domain, type in the full address (in the example below it would deliver email to email@example.com to the mailbox firstname.lastname@example.org