If you’ve signed a mortgage since Bush 1 was in office faxes have been sent for you. Car loans. Any medical thing that involved more than 3 doctors. Faxes are a constant in life, the software makes it invisible, but it’s still there. Really there’s a very good chance those PDFs you’re e-mailing are being handed to fax software by your mail server. I used to think “nobody sends faxes” then I got this job and looked at the customer lists (about 450 of the Fortune 500) and realized that while I personally might not be sending faxes, my life is faxed.