Stop in for a cup of coffee

Does USPS have any specs that must be met? I know they has some for their placement on roadways. Found that out when I built one for a friend using a wine barrel half as a base. Had to be just so high and just so close to the curb, yadda yadda.

To get drawings and measurements for building your own mailbox, write to US Postal Service Engineering.

Engineering
US Postal Service
8403 Lee Hwy
Merrifield VA 22082-8101