How do I block spam e-mail addresses from following my blog?

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  katzgreen · Member · Jul 3, 2013 at 2:10 am

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  How do I block spam e-mail addresses from following my blog?
  For the last few weeks I have been having users subscribe to my blog with email addresses ending with 72w.com. How do I deal with these? I have been deleting them but I can get over 10 a day some days.
  Thanks
  Katz

  The blog I need help with is: (visible only to logged in users)

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  katzgreen · Member · Jul 3, 2013 at 6:13 am

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  Okay well how would anyone deal with these?