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As you may or may not know, gmail in its infinite wisdom (and disregarding the need of forums/qa's) allows first.last@gmail.com to be equal to firstlast@gmail.com.   You can even do f.i.r.stlast@gmail.com.  

So spammers can use the same gmail to register multiple times.

Need a plugin to prevent this, anyone?
Q2A version: 1.7
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Most spammers use completely different mails, ips and users names. Is your site experiencing problem you mentioned ?
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Here are some examples.  You can see the variations of the same email.

http://stopforumspam.com/search/massdoing6%40gmail.com
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Good find, i hope somehow this is possible.

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