- a list of names and addresses of persons considered by a business, charity organization, etc., to be likely purchasers or donors.
Origin of sucker list
A list of names of likely prospects for making purchases or donations, as in Some charities raise money by selling their sucker lists to other organizations. This term uses sucker in the sense of “dupe,” a usage that in turn alludes to the naiveté of a baby suckling at its mother's breast. [Colloquial; 1940s]