I too have wondered where the term came; post. It is an old term and I have gone on excursions to find the why but no diffinitive answer could I find.


[Power On Self-Test (my favorite...no POST, no posting...lol)

In papermaking. a stack of 144 sheets of handmolded paper, interleaved with felt.

posting is a moderate to deep passing route in American football

part-of-speech tagging (POS tagging or POST)

Posting or postadh (Scottish Gaelic) was a process in washing clothes

Post, a name for a military base

Post, an entry in a blog or internet forum.

a POST message is a type of HTTP request message

The Persian system worked on stations (called Chapar-Khane), where the message carrier (called Chapar) would ride to the next post.


Well before the Middle Ages and during them, homing pigeons were used for pigeon post.]



But this is the one I think it comes from:
The verb meaning "to affix (a paper, etc.) to a post" (in a public place) is first recorded 1650.


anybody have a better concept?