Blogspot Robot | WordPress.org

I’m being hit with registrations every 30 minutes. They have random emails and usernames but have one word “blogspot” in common on all in the username. See example below. How can I block these attempts please?

“New user registration on your site MARIJUANA HANDLERS™:

Username: http://www.sbeevf.blogspot.ca – 40 930 USD PEPE kro

Email: [email protected]“

The page I need help with: [log in to see the link]