Once "email"* entered the lexicon, we needed a term to differentiate it from what we can call regular, hand-delivered mail. One term in broad usage is "snail mail." But in a project I'm working on, we need a term that is more formal and businesslike.
As currently written, the copy reads: "Terrestrial mail."
I'm looking for a good term to replace "Terrestrial." Any ideas?
(*AP Stylebook has eliminated the hyphen.)