Newman was definitely one of the most popular recurring characters on Seinfeld, serving as Jerry's antagonist on the show. Newman worked for the post office and often was a part of Kramer's schemes.
George: Let me ask you something... What do you do for a living, Newman?Newman: I'm a United States postal worker.George: Aren't those the guys that always go crazy and come back with a gun and shoot everybody?Newman: Sometimes.Jerry: Why is that?Newman: Because the mail never stops. It just keeps coming and coming and coming. There's never a letup, It's relentless. Every day it piles up more and more, but the more you get out, the more it keeps coming. And then the bar code reader breaks. And then it's Publisher's Clearinghouse day.Jerry: All right, all right.