Siteadvisor is a useful website that has an automatic script running that does nothing else than to signup at websites with a unique email and count the spam that is generated from this account creation.
They already tested more than one million websites and their database is growing daily. They also test if the site offers risky downloads or bombards the user with excessive popups. Just enter a site that you want to signup for (or already did) in the search field on top of their starting page.
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