Hold-ups at the Post Office Drive Through

Rant, rant, rant!  When I go to the outside drive-through box at the post office, it is because I am in a hurry and don't want to park and go inside.  But apparently this is not the case for all.  Some people choose to pull to the drive through box and then begin to sort whatever is in their front seat.  If you want to do that, please park in the front and take all the time you need.  If you are pulling to the drive through, the least you could do is have your mail ready so those behind you don't have to wait an eternity! Arrrgh!  I hate waiting!!