free fax receive online

Which online fax service can I use to receive faxes totally free?

I just need a one time use (so free trials are ok). I need to RECEIVE a fax. And it needs to be absolutely FREE.
www.k7.net is asking for a verification code. Do you know where I can get one?

http://www.K7.net for receiving fax
http://www.GotFreeFax.com for sending fax

How to send FREE Fax Online !