I've used this service for about 15 years, and have loved it--until we had to install the SPF, and it
Would not send a fax without it.
It called for knowing my domain, or server, and I just use a common (although standard business) microsoft outlook email. Most of us don't know our demain name or server. Now, I'm not sure if I did it correctly. Is there any way to tell? Other than that, it has been a terrific service for my business. I could fax from anywhere and receive anywhere in or out of the country. It was very reasonable for the application, and I hope I can use it again.