I get these kinds of "warnings" quite often. I have no idea what kind of violation has occurred, who did it, how they did it, or what posts or ads were involved. Nor do I have any idea what I can do about it. Neither of the links provided in the email have any information on such things, nor are they an opportunity to ask questions. I don't have anything to do with AdSense besides enabling Blogger to put ads on my site, and the rare payment they send is not really worth bothering about it. Google pays for the bandwidth and takes the ad revenue, I provide eyeballs and get about $100 a year. If they want to suspend my ads, I would barely notice it. So why do they even bother sending these useless notices?