Messages

It may be an older notification from a message, but you were already logged onto the site and checked it. Since the e-mails are auto-generated, I don't believe they log whether or not if you've opened the message, but rather if you've received one. If you'd like to turn off e-mail notifications, you can do so in your settings.

I got another notification today. I've never chatted with the person before, or even seen them on the site.