Re: I've seen a definite uptick in these
Little tip if you use Gmail... you can add indicators to your email address by using a "+", such as if you address is JimBob@gmail.com -
Google will effectively ignore the +<word>, so emails still arrive. But it will show in email details. So not only can you filter (make rules etc) on it, but by setting the <word> to the site name you entered it into, you know exactly where they sourced your email from (Little trick I learnt from the GApps team at work).