Holder for holding different sized mail containers

The invention relates to a holder for holding different sized mail containers having a first wall, a second wall opposite the first wall, a rear wall connecting the first and second walls, and a bottom support in contact with the first, second, and rear walls. An extension extends laterally from the first wall and has a stopper placed on top of the extension. The bottom support is adapted to receive a first mail container between the first, second, and rear walls. The extension and top end of the second wall are adapted to receive a second mail container, wherein the stopper inhibits movement of the second mail container. A mail tote sits in the holder while a mail tray sits on the holder.