Mailbox lock

In combination a rural mailbox having a generally horizontally disposed longitudinally elongated housing defined by a peripheral wall provided with an arcuate top surface and an open end, a closure door pivotally connected to said peripheral wall at a bottom edge of said open end, a mailbox lock selectively maintaining said door in closed relation to said open end of said wall, said mailbox lock comprising a three segment hasp mounted on said peripheral wall adjacent said open end, said three segment hasp including a mounting segment attached to said peripheral wall adjacent said open end by fasteners extending through said mounting segment and said peripheral wall, a fastener covering segment pivotally attached to said mounting segment at an end thereof remote from said open end of said peripheral wall in overlying protective relation to said fasteners extending through said mounting segment, said fastener covering segment of said hasp extending beyond an edge of said open end of said housing and beyond an edge of said door, and a door locking segment pivotally mounted on an end of said fastener covering segment outwardly of said door for overlying an outer surface of said door, and a lock member mounted on said door in releasable locking engagement with said door locking segment of said hasp to releasably retain said door locking segment in overlying relation to said outer surface of said door when said door is in closed position in relation to said open end of said peripheral wall, said door locking segment of the hasp including an opening, said lock member extending through said opening when said door locking segment is pivoted toward said door, said lock member being rotatably mounted on said door for rotation about an axis perpendicular to said door locking segment of said hasp to position said lock member in overlying engagement with a portion of said door locking segment outwardly of said opening for locking said door in said closed position, a support post projecting from and rigid with said door, said lock member including a key operated lock cylinder lockingly engaged with said support post, said lock member and lock cylinder being rotatable to an unlocked position when a key is inserted into said lock cylinder and rotatable from said unlocked position to a locked position without said key being inserted into said lock cylinder.