Editing Letter box (section)

===Canada===
For those neighbourhoods where mail delivery is to a mail slot, the mail slot must have an opening not less than 17.5&nbsp;cm by 4&nbsp;cm, and must be located in a front door or adjacent panel not more than 125&nbsp;cm and not less than 60&nbsp;cm from the finished floor line.<ref name="CPR">Canada Post, ''Mail Receptacles Regulations SOR/83-743: Regulations Respecting the Delivery of Mail To And the Collection Of Mail From Certain Mail Receiving and Dispatching Facilities'', Canada Post Corporation Act, Department of Justice, 15 September 2006</ref> Wall-mounted mailboxes equipped with a slot must have a slot opening measurement not less than 13.5&nbsp;cm by 4&nbsp;cm and the slot located on or near the top of the box.<ref name="CPR"/>

Curbside mailboxes, known in Canada as rural mailboxes, must be weatherproof, have space for the name of the mailbox owner, and possess a signal device on the right-hand side (when facing the front of the mailbox) for pickup of outgoing mail.<ref name="CPR"/> The signal device must rise above the mailbox and be visible at a distance, and must not obscure the mailbox owner's name or impede vehicular or pedestrian traffic.<ref name="CPR"/> Canada Post requires all rural mailboxes to have a minimum interior dimensions of 45&nbsp;cm in length by 17.5&nbsp;cm in width by 17.5&nbsp;cm in height for a rectangular mailbox, and 45&nbsp;cm in length by 25&nbsp;cm in diameter in the case of a cylindrical mailbox.<ref name="CPR"/>