Maybe it is a phishing email?
I have a feeling its this.
are you an idiot? did you read the email? did they ask for any longin or identification details? you should just go kill yourself
OP a site you signed up on probably sold them your email, or someone used your email to signup
Information mining is big business..
and keeping them from getting your information is even bigger business.
Learn to use distraction tactics and tunneling methods such as TOR to keep off the radar and become a information hermit.