It appears that my email was hacked today and used to send a couple (or more) emails to most of the people in my address book.
There is no subject line in the email. I always put something in the subject line.
If you open the email(s) it has a link or web address to click on that ends with a co.cc domain.
If you click on the link it redirects you to some other website that's selling something.
I would suggest deleting it without opening it.
Again, if I send you an email there will be something in the subject line.
Sorry 'bout that.