Repetitive Spam Comments Blocked..

I have recently been getting multiple (3-5) comments every single day on my blog regarding either auto insurance or health insurance. However, the comments are all marked as spam before they’re ever posted.

My question is this: Is there a way to simply block any comments sent using a variation of an email address? The spammer who has been posting uses the e-mail “d##s_test###@hotmail.com” on all of his comments, with the ‘#’ signs being a random number each time. Apparently they don’t understand that their comments have not been– and never will be– posted.

Thanks.