Adsense for email exists or not?

Many readers ask that is there any adsense for email or how to include adsense in emails

According to Google program policy about adsense , adsense cannot be placed in popups, popunder and emails. Now question is that why google does not allow adsense for email when email is the most frequently used media on internet. It answer in my mind is may be because of spammers, as spammers send millions of emails in few minutes which are unnecessary emails and if google allows email adsense then users of Google adwords will be in trouble and reliability of adwords will be reduced.

On the other hand Google started adsense for feeds. Publishers can earn more revenue with Google adsense for feeds. Now how it works? It is very simple google place ads in feed newsletters which are received by only subscribers of that feed.

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