(I set up temporary redirections for customer’s mail after a house move whilst they get around to telling people that they’ve moved.)

Me: “How long would you like us to redirect your mail for?”

Customer: “Until everybody knows I’ve moved.”

Me: “Well, how long do you think it will take you to tell everyone?”

Customer: “Me tell everyone?  Don’t you do that for me?”

Me: “Sorry, but that’s up to you. We don’t know who writes to you.”

Customer: “Well you should! You deliver the letters to me!”