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I've also just received an email from 'shetookmyboxer' promoting a youtube clone, site is phplooker.
Why not just restrict how soon you can send a mail message to a week or more after you sign up?
Also, how about limiting the number of emails you can send per day to 2? If you can only send 2, it's not worth a spammer's time.
Finally, force one of those tests that confirm that the sender is a person, using random text in an image and asking the user to type the text.
Peter
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