The fax protocol includes a strong "read receipt" type mechanism that the machines can't ignore. "Did you get the last page?" "Yes, no bad lines."
Legally, this is interesting because it doesn't exist in email. You had the machines agree that the complete document was sent and was received. You will certainly find that it other transfer protocols, but not email, where the machines don't talk to each other directly.
Legally, this is interesting because it doesn't exist in email. You had the machines agree that the complete document was sent and was received. You will certainly find that it other transfer protocols, but not email, where the machines don't talk to each other directly.