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Are you familiar with Google Adsense? If you own a blog you register with them and place their ad in your blog. Then when a reader clicks on it you make money.

Email marketing ad networks work the same. You register, find an affiliate you like which complements you and your style, then link their ad in your email. It does not cost you a penny. It makes you money every time your email reader clicks on that ad.

NewsletterDirectory.co and LiveIntent are two examples.

Whao, this is really amazing. Would check it out

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