This has annoyed me for years. I had a discussion over what a fax actually is with a lawyer a few years back. My issue was that many firms had electronic fax systems that allowed them to send 'faxes' from within their email client. If I send an email/fax via this system to a company with a similar system I wanted to know how it was a different means of communication to an email. I could stick a jpeg of my signature in both, but one is legally binding.