Dont know about tipping but I have often thought about slapping the horrible fker we,v got , if there is a parcel to be delivered he will knock and Im sure he runs away ,no matter how quick you answer the door all thats there is a note to pick it up at the office , he bends xmas and birthday cards to post them ,even though he doesnt have to ,wet and torn mail is routine ,but worse of all he is ugly ,and I mean really fkn ugly ,not just your average Tomo /Gnasher type ugly , but absolutly repulsive , a real traumatic sight first thing in the morning .