Postmark may refer to one of two artists. 1. Postmark is the musical alias of Mark David Hamilton, a funk / hip hop artist based out of Toronto, Canada. Mark relies heavily on the sampling, chopping, and restructuring of his record collection as the basis for his musical explorations and creations. 2. Postmark is the musical nom de plume of Sahan Jayasuriya, a musician based out of Milwaukee, Wisconsin. His music is highly characterized by vocal harmonies and loops, all processed with heavy amounts of reverb.