Site under attack from New Subscribers

I have a wordpress site and for about the last 5 days I’ve been getting about 3 new subscribers an hour all of whom are using a blogspot URL as their user name, and the links are all redirecting back to the [SalesForce.com](http://SalesForce.com) website. I’ve tried contacting SalesForce but they claim it is nothing to do with them, in spite of the fact that nobody else would have any motive for doing this.

How can I disable the new subscriber feature for the entire site? Just the notifications alone are driving me crazy.

 

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