Mail Drop Box Sizes & Dimensions for FedEx, UPS, and USPS Post

Mail Slots 4035 Mail Slot - standard - letter size • 8-34'' W x 2-34'' H • rough opening: 7-14'' W x 2-14'' H • mail flap: 7-38'' W x 2'' H • 2 lbs

From the Manufacturer Salsbury 4000 Series Standard Letter Size Mail SlotsLetter size mail slot overall dimensions are 8-34'' W x 2-78'' H may be used for

mail slot for wall From the Manufacturer Salsbury 4000 Series Standard Letter Size Mail SlotsLetter size mail slot overall dimensions are 8-34'' W x 2-78'' H may be used for

mail slot cabinet 2 Answers 2 No sure of where your data from But from Msdn, It says: The data in a mailslot message can be in any form, but cannot be larger