[Darryl Ramm]

Have I Been Pwoned is a *very* well respected security web site. And since that URL uses https, you can be confident that it's really that web site you are seeing. If your email address is listed there on "sites" you don't think you have been to it's a sign that somebody else may have been using your email address, or some bad sites have some of your data (some "sites" where your email address will be reported consist of data stolen elsewhere). It does not necessarily mean your email account has been compromised, but change your password anyhow.