Possible Scam

Not sure if this is the place to ask this question or not as this is my first time on this Norton page but lately I have been getting e-mail from this webpage Norton@ucaksoam.com regarding my Norton product it says.  This morning the heading was something like "regarding your Norton backup done June 24, 2016.  The two before had the heading that I had been hacked.   I've not opened any of the e-mails as I'm pretty sure they are either spam or scams since the e-mail heading wasn't from Norton.com .    Has anyone else had this problem?  What puzzles me is how they know I have Norton on my PC.  I've run the Norton eraser several times lately and it has not found anything wrong.