In my experience (now perhaps ten or more years outdated), fax is still legally preferable because of the time stamping available to both sender and receiver, g

In my experience (now perhaps ten or more years outdated), fax is still legally preferable because of the time stamping available to both sender and receiver, giving fax a proof of point-to-point transmission and receipt email doesn't provide. Also, back then (2010 or so) my employer dealt with a lot of remote sites (logging camps and lumber yard offices) that had POTS but no Internet. That has probably changed a lot.