Getting “new user registration” with the user name starting with “test”

I am constantly getting new user registration emails and my blog does not require registration. Every email looks identical with the user name always beginning with “test” followed by a series of numbers.

The returning email is always from email.imailfree.cc

Is this spam? Cause I’m starting to think it is and how do I stop it? I’m still so new to blogging and wordpress I don’t know where to resolve this. My Gmail is being blown up by all these “new user registrations”.

Or is this people trying to subscribe to my blog? I really have no idea.

Any help or insight would be great.

The page I need help with: [log in to see the link]