The phrase "deal newsletter" refers to a regular publication or email that provides information about current promotions, discounts or special offers from a particular business, store or company. It is usually sent to subscribers who have opted-in to receive such updates, and contains details about limited-time sales or exclusive deals that are not advertised elsewhere. The newsletter aims to keep customers informed about the latest deals and incentives, with the goal of encouraging them to make purchases or take advantage of the special offers.