How to get postal service

I’m walking the dogs when I run into my mailman:

Mailman: “Eek! Those are huge dogs! Makes a mailman wanna piss himself! Are they friendly?”
Me: “Oh, most of the time.”
Mailman: “Heh. Huge all the same. What apartment do you live in?”
Me: “53B.”
Mailman: “53B?”
Me: “Yes.”
Mailman: “I’ll make sure you get your mail on time then.”
Me: “So that’s how to get service!”