Telebroad's print2fax is yet the best efax service because I no longer need to print & scan my documents & then upload to my email service. With Print to Fax all I need is Click Print on any windows application, like Word or Excel & by selecting the "Telebroad Print2Fax" printer it immediately prompts me to enter the fax number.
I also get to see online all my sent/received faxes for backup & easy access.
For outgoing faxes to successfully work, it requires a working Internet. (does not affect inbound faxing).