A fax receipt is another name for a confirmation page.
It contains a summary of information about a fax transmission, including date, time, the machine that sent the fax, and the machine that received the fax. The sending fax machine prints it at the end of the fax transmission.
At the end of a transmission, the sending fax machine waits for a signal from the receiving fax machine to say “transfer complete.”
When the sending fax machine receives this signal, it prints out a fax receipt to show proof of receipt.
The fax receipt typically includes the date and time the transmission started and finished, as well sending and receiving information. There may be copies of the first page or multiple pages in the sent fax. These features vary by fax machine manufacturer.