I have an email website. I earn my money from adsense. But in order to increase clicks, I want my site to start displaying ads related to the subject of the emails. Example, If a person sends an email to user @ [url removed, login to view] and the subject of the email is: Free movies Online. And when the user clicks to read the email, I want adsense to display ads related to movies, fee, online. Just like gmail does.