Md. Code, Alcoholic Beverages and Cannabis § 3–506

(a) This section does not apply to:

(1) the delivery of wine from a direct wine shipper to a consumer using a common carrier in accordance with Title 2, Subtitle 1, Part V of this article; or

(2) the holder of a common carrier permit in the course of delivering directly shipped wine in accordance with Title 2, Subtitle 1, Part V of this article.

(b) Retail delivery to a purchaser of alcoholic beverages is prohibited unless:

(1) a retail license holder obtains a letter of authorization from the local licensing board to make deliveries; and

(2) the delivery is made from the licensed premises by the retail license holder or an employee of the retail license holder.