When I try to send a PC-FAX, the paper is printed out instead of sending the FAX. (Linux)

Check your BRFAX's driver setting, select "Brother BRMFCFAX for CUPS(en)" for the driver of your BRFAX.(BRFAX with cups)

Open the CUPS web interface http://localhost:631/printers
Click "Modify Printer" of "BRFAX" and select the following driver for your BRFAX on Model/Driver menu.
"Brother BRMFCFAX for CUPS(en)"

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