Faxes are considered the only secure communication channel by medical companies. Email is not secure. The Vatican has the same stance. They pope communicates via fax the majority of the time, per 60 minutes.
Which is utterly insane, because faxes aren't encrypted. All anyone would have to do is tap into the phone line and copy the signals and they could print out any fax that was sent over the wire.
I mean they have a few niceties like having to physically be in the same spot to interact with it and lacking any sort of central discoverability. There’s not really an equivalent to email:francis@aol.com password:p0p3 and having anybody with a computer getting a copy.