I upgraded our login/logout and registration pages today with new forms. When I published the new forms, the plugin used for subscriptions and social media saw them as new posts and sent out six emails. I apologize for the confusion and you can just delete the emails. There is no need to re-register, change passwords or take any action. This is just an upgrade along with moving to SSL. Instead of the original http:// we now have https:// for added security.
Again, I apologize for the inconvenience.