USPS Standards for Residential

Domestic Mail Manual D041 Customer Mail Receptacles usps mail slot requirements USPS mailbox regulations state cluster mailboxes installed in all new construction and major renovations of multifamily buildings must meet STD-4C usps mail slot Requirements and restrictions by destination Lock the parcel compartment and drop the parcel key in the outgoing mail slot of the community mailbox

shiba slot • If you have a curbside mailbox, or a mailbox on the outside of your house, USPS Conversely, USPS regulations do not govern what can be placed in a mail slot