gchiu: Just a reminder that you can only email PDF and TIFF files for faxing. Others including PS are not permitted. So, don't try faxing Word documents etc.
Are you referring to hellofax.com using the initial 5 free faxes or are you a paying member ?
If you could make a new account and send a fax for free to an nz number that would confirm to me that is does what I want it to do for free