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If you have an information product for sale, the chances are good that some people will buy your product even if they have not already signed up to your list.
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Since you don’t want to lose contact with these customers, you should make sure there is an opt-in box on your thank you (or product download) pages.
Some people force their customers to opt-in before they get their product. This is not recommended most of the time as it can really irritate people who have bought your product and just want access to it. What you might do instead is include an extra bonus for signing up make it an offer they cannot refuse.

