Twilight Princess Mailman

Hey all,
So, I have recently been wasting my life away in Twilight Princess (I am obsessed), and I've been noticing that the mailman appears in a number of random places. I've found him in the barn in Ordona, in the hotel in Kakariko, in Telma's bar, and I've heard that he can also be found somewhere in Zora's Domain and in the Cave of Ordeals. Does anyone know where else he can be found? I feel like he should have a location in Faron and in the Peak province as well, right?

Anyway, I hope someone here can put my OCD to rest. If not, I guess I'll go join a Zelda forum and ask there. :D

I've only ever seen him in the places you mentioned, sadly. :(

He's behind the throne in Zora's domain! Other than that, no idea.