An email alias may be useful when you need to approve or otherwise administer an SSL certificate. This is often the case because SSL providers often want to send "approval" email messages to one of a few designated email addresses such as:
If you do not have one of these email accounts setup you can create an email alias for one of your existing email accounts.
G Suite Users
If you have a G Suite Business account, the following document describes how to setup an email alias. These steps are for admins who manage Gmail accounts for a company, school or other group.