I receive daily some emails which include the ads. how it is possible? And is it legal? Also, does ppc is same as people visiting website?
i tried to send by email using PHP mail send script but in mails ads do not show actually i was making a research that after how many earnings Google ban account as i have many AS accounts for research purpose only
Why do people think websites are the law? Legal = laws of your state and country, not Google's Terms of Service.
yes this is against the Google Adsense TOS you might be gets banned for that if you are doing this kinds of stuff.
As everyone has pointed out, placing Adsense ads in emails is against the Google program policies - feeds are OK. Here is the exact text: