This tutorial details how to block outgoing faxes based on fax number.
Info, Notes and Warnings
This affects the entirety of the etherFAX account where this is applied. It cannot be made specific per a user on an application, or a device, as it is a global setting that affects all etherFAX outbound submissions on the account where the block placed.
Prerequisites
Before reading these instructions be sure that the following prerequisites are met: