Post Office

P. G. Wodehouse... used, when in town, to solve the problem of the long walk to the post-office by the simple expedient of tossing his letters out of his window: his belief that the average human, finding a stamped and addressed envelope on the pavement, would naturally pop it into the next pillar-box was never once, in decades, shown to be unfounded.

~ Stephen Fry

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So I guess the post office comes from the history of riders posted across the country to hand off and deliver mail.

I guess that Post Toasties comes from the history of riders posted across the country to hand off and deliver toast.