Just started my proxy sites Averaging 500-1000 impressions and 5 dollars a day Not much Got this email What does it mean t has come to our attention that invalid clicks or impressions have been generated on the Google ads on your site(s) through users of third-party programs paid or provided with other incentives to visit your site. Such programs include, but are not limited to auto-surf, pay-to-surf, pay-to-read, or pay-to-click sites. Please bear in mind that if we continue to detect invalid clicks or impressions from these services on your ads, we may disable your account to protect our advertisers. In addition, we may adjust your future payments for any days during which invalid clicks occurred in order to properly credit advertisers for any invalid activity. We understand that you may wish to receive specific information regarding the invalid activity we observed on your account. However, due to the proprietary nature of our algorithm, we cannot disclose any details about how our monitoring technology works or what specifics we found on your account. As a reminder, any method of generating invalid clicks or impressions is strictly prohibited by our Terms and Conditions and program policies: https://www.google.com/adsense/localized-terms?hl=en_US https://www.google.com/adsense/policies?hl=en_US For your reference, you can find tips and guidelines for keeping your account in good standing by visiting our Help Center at https://www.google.com/support/adsense/bin/answer.py?answer=23921&hl=en_US. Sincerely, The Google AdSense Team
Simply that that someone has been clicking heaps on your ads or that they think you paid people to come to your site or click your ads. It's just a warning email but if it keeps happening they'll ban you.
It is first warning from Google and next time if this happens again you will get bad news about Account Suspension. So keep a closer eye on your aadsense stats and if you find any abnormal increase in CTR - Simply email to Google