This is a scam - possibly downloading viruses when you click to receive it. Since I received it on 4 different email addresses within 10 minutes - it's doubtful this is anything but scam/spam or worse. Do NOT link to find out the fax. At best it's spam - at worst you will be exposed to malicious software.
I also received an email message claiming that I had a fax. Note that the link for the fax will actually open a zip file, which is very suspicious. I searched the internet for information about the zip file (efax_4053146690.zip) and apparently it does have a virus. Another big clue that the message is a scam is the fact that there is no indication of who sent the fax.