Aah man, the post office. I'm guessing that would be... The Shopping Gate?

[Who even uses post offices anymore? Yeesh. Give her a moment as she quickly goes over everything she remembers on her trip home today...

Ah, wait a moment!]

Think you're out of luck on the post office front. If you want to send some love letter off to another house here just write the number on the envelope and slam it in your mailbox.