To block a fax number, click Fax Options in the Fax over Email Overview page, and then click Blocked Numbers.
In the event you receive unwanted faxes, such as fax spams, you can block the originating fax number very easily. In the Add Blocked Numbers field box, enter the fax number you wish to block and click Add Blocked Numbers. (Just enter the number without hyphens, e.g. 5553121234).
Alternatively, go to My Fax Inbox and locate the unwanted fax, and then click its corresponding Block link.
You can remove a number from this list anytime by returning to the Blocked Numbers page, select the number and click Delete Selected Blocked Numbers.