A while back there was a startup with this exact idea from the HN community. (http://news.ycombinator.com/item?id=1294079 http://news.ycombinator.com/item?id=1

A while back there was a startup with this exact idea from the HN community. (http://news.ycombinator.com/item?id=1294079 http://news.ycombinator.com/item?id=1294079) I love the idea, and said so then. I talked with the developers a few times and learned recently that they had shelved the product. There are some existing enterprise solutions for electronic faxing. While building a service for smaller companies (and individuals that have the need to fax now and then) seemed to be a very difficult market to penetrate. I'm not suggesting that their decision to shelve the product indicates it's not possible for you to succeed, but I do know they gave it a good shot and couldn't make money at it. Perhaps going after a single industry, as you're suggesting, and vetting the idea (and price point) with them ahead of time, could get you closer to understanding if this is sustainable or not.