Had the same thing on my site yesterday. User name admin22 and same email address. Naturally with the user of “admin” I was somewhat inquisitive especially with no user name attached. Searching it came up as a MP3 music download site. I have removed it as a user from my blog.
I welcome user registrations, but also go directly to see who is registered and promptly delete those that are not deemed value added to the collective group of blog audience.
I recommend you set you ensure your settings for new registrants are set to subscriber only. You can change them alter to authors or even admins if you so choose.
