Was the email from the forum, the personals, or outside of this site? It's possible you were subscribed to a thread that someone recently posted to. You're welcome to stay so long as you abide by the site's guidelines. What determines whether someone stays or goes is ultimately based on the content of their posts.
It's possible your email account got linked into a social network (like Google+). However, the best person to ask is the person who sent you the email.