What's the difference between named pipe and mailslot ?

They are also typically less expensive than post-mounted mailboxes The USPS Mail Slot Guidelines If you don't already have a door or wall mail slot,

SKYSHALO Through The Wall Mail Slot Off Box - Secure Mail Vault for Mail, Rent, Checks, and Cash

mailbox slot cover Order a 9-slot teacher mailbox that can also be used to organize and store paperwork, or opt for a jumbo 27-Slot Mail And Supplies Center with

mail slot drop box Three style options are available on the residential mail slots from These deluxe style mail slots are USPS approved