You will be prompted to setup your authorized email address in your activation steps the first time you login to your account and have clicked on the “Activate now” box.
In the future, you can change this email address by going to Service – Fax Service Preferences and modifying the email address.
We only allow one authorized email address to be entered, however an easy way to give access to several individuals to use the service is to create a group type of email address that several individuals can send from. For example, your accounting team is comprised of Bob and Susan and they both need to fax. Instead of choosing Bob from accounting to fax and setting it as "firstname.lastname@example.org" have your IT person setup "email@example.com" so that Bob and his assistant can both send from that address and regularly check that inbox folder for received faxes.