Season 9, Episode 5: "The Junk Mail"

Then what about your cards and letters?

E-mail, telephones, fax machines, FedEx, Telex, telegrams.

-Holograms. -All right. It's true.

Of course nobody needs mail.

What, you think you're so clever, figuring that one out?

But you don't know the half of what goes on here.

So just walk away, Kramer. I beg of you.

Is everything all right here, postal employee Newman?