A mailing machine including a base, a registration wall and a stripper blade. The base includes a deck defining a deck plane along which an envelope having an envelope body, an envelope flap and a top edge may be fed in a path of travel. The registration wall is located substantially perpendicular to the deck and parallel to the path of travel and along which the envelope top edge may be aligned during feeding. The stripper blade is located upstream in the path of travel from the deck, the stripper blade including a knife edge that is raised above the deck plane for separating the envelope flap from the envelope body.