A well-known player among online fax services, eFax is a flexible digital faxing platform that allows you to send and receive faxes via email, the internet and your mobile device.
eFax delivers rich features that are ideal for small to mid-size businesses.
eFax is one of the most feature rich online fax providers in the world. All of their services offer a HIPAA compliance setting (though they will not sign a Business Associate Agreement), offer iPhone and Android apps, the ability to eSign documents and fax them back and Microsoft Office integration. They are the only company to offer ALL of these features in a single service.