Each time a client opts in to your auto-responder or newsletter, you obtain their email address.  This gives you the power to advertise to these people at will. 

One of these items is giving your subscribers or other advertisers the option of using your newsletter to advertise their products for a fee.  This will give you a little extra income from your newsletter, which doesn’t cost you anything.  Remember, you don’t have to mention that you’re selling the ad space, but you can let clients know that it’s available.  They can contact you if they are interested, after which you can negotiate the fee. 

A great source of potential advertisers is affiliate programs.  You can find lots of them through tan affiliate network like Commission Junction.

Keep in mind that your subscribers trust your information. They also trust your opinion on products advertised so be sure to keep your newsletters full of information that’ll be useful to them. If others are using your newsletter as ad space, make sure that it’ll be in compliance with what your subscribers want to hear and see.  They will opt out if they’re not satisfied with the content, so be sure to keep their interest.  This can also happen if you overload your newsletter with advertising.  Maintain a balance with the objective, useful content.

Remember that unsolicited email, or SPAM, is a large concern for many people. Many email users use SPAM filters and SPAM blockers to avoid receiving unwanted email. Regulators have enacted the CAN-SPAM Act to restrict the activities of email marketers.

Click here to read a summary of the CAN-SPAM Act