Short & sweet (targeted emails, sent out 1 by 1) is by far the best method.
Direct interested parties to the sales listing where they can make offers or purchase the domain outright.
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Hello,
BusinessProducts.net is now available for acquisition.
Your company may be interested in incorporating this additional domain in your online marketing strategy. The sales page can be found at www.businessproducts.net
Feel free to let us know should you have any questions regarding the sale of this memorable domain.