Please click the double opt-in confirmation in your email when you subscribe.
A response from Bob @ Ghost
Hey Steven,
Thanks for getting back to us.
A member would only be signed up if they click the double opt-in confirmation they receive in the email. If they omit that step, they would not be fully signed up.
I just tried the signup form on your site and got the email in my mailbox, but also did not click through to complete the sign up.
Hope that clarifies it.
--
Bob @Ghost