when front access door 7 is closed channels 19 and 20 are formed by flanges 21 and 22 each of which is secured along one side edge to the inside of the associated side wall 2 and 3 the free edge portions of flanges 21 and 22 are each spaced from the associated side wall to form channels 19 and 20 respectively any excess water entering around front access door 7 simply flows down through channels 19 and 20 disposed outwardly of flanges 17 and 18 similar structure is associated with rear access door 10 in the form of rear access door flanges 17 a and 18 a and channels 19 a and 20 a as shown in fig5 in order to secure the mailbox to the ground mounting means in the form of plate 23 and post 24 are provided wherein post 24 is inserted into the ground and bottom 5 of the mailbox secured to plate 23 by means of conventional bolts 25 pins 26 are attached to post 24 in order to prevent unwanted withdrawal of the mailbox in operation when outgoing mail is placed in the mailbox front access door 7 is simply rotated open by means of handle 27 and the mail placed on tray 14 when the carrier delivers mail he simply removes the outgoing mail in tray 14 and places the incoming mail on front access door 7 access door 7 is then closed wherein the delivered mail slides downwardly along security barrier 9 when barrier 9 moves to the position shown in solid lines in.