An excellent way to test both sending and receiving faxes is to use the free HP fax service. Remember that this services uses your caller ID to determine what number to send the return fax to.
- Simply send a fax to 1-888-HPFAXME (1-888-473-2963).
- Within 5 minutes you should receive an incoming fax confirming receipt of your original fax.
Another service I’ve used to generate test faxes from a web browser (not requiring you to have a fax machine) is faxZero.