I got a email from adsense" Attract new customers today with a Free Rs. 1500 coupon" pls describe....
I think google sends this kind of message to publishers like us to participate in adwords campaign. You are given an opportunity to drive some free extra targeted traffic
You should reply to the same email address for a description as we have not seen the email so we cannot describe it and it might not be from a genuine source so its better to reply to the same email address and ask for a detailed description.
I got $100 free adword coupon & I used it. But I get poor result. Exveyday I get 130-140 impression & 7-8 click & it cost me $2