Send an email to a fax machine
MakeUseOf.com’s Ryan Dube has a useful post:
I’m not really the type of person that sends faxes all that often. There may be an occasion or two when I have to forward information to my insurance company or the Human Resources department at work, but those times are very few and far between. However, since I don’t fax very often, whenever I do have a need to send a fax I used to scramble to find an available fax machine. After I started writing for MakeUseOf, I decided to reassess this occasional need and come up with a solution that would make use of available free online technologies and resources. I started looking for an answer to the question, “Can I send an email to a fax machine?”
And so began my quest into the world of free online faxing. The only requirement that I set when I started this search was that the resource must be free, it must allow, at a minimum, a full textual document to be sent over the Internet. The ability to send formatted documents would be a plus, but since most of the time I just need to send over information, the ability to send an text email to a fax machine is really all I usually need…
Continue reading to see his comments on the 5 services he identified that can do this.

If you are an occasional fax user then free services will suffice. But for businesses free services will be a drawback since this services are slow, filled with ads, lacks customer support, limited in features and functionalities.
Online Faxing
28 January 2010 at 8:23 pm
Why not simply scan a document and send it as email attachment? Works for me!
Klaus
28 January 2010 at 10:45 pm
I don’t have a scanner. I suspect that the people without scanner are probably the target. But also quite a few offices still avoid giving email address (doctors, dentists) but do readily provide fax numbers.
LeisureGuy
28 January 2010 at 11:10 pm