Canon PIXMA MX870 - Manual (Page 780)

6. Use the button to select ON, then press the OK button.
Important
Transmission will be canceled if the machine fails to receive the recipient's fax
information or if the received information does not match the fax number.
This function is not available when you send a fax manually. For details, see
Sending a
Fax after Speaking on Telephone .
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Page 780 of 1127 pages Preventing Mistransmission of Faxes