Sumner Surname Mailing List The Sumner surname mailing list is hosted at RootsWeb.com. This mailing list is designed to make it easy for researchers of the Sumner surname -- any spelling -- to correspond with each other. Frequently Asked Questions. Information on how to subscribe to this list, how to send a message to all subscribers, and how to access the archives. SUMNER e-mail archives Search the archives of the Sumner Mailing List.