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A message sent to a newsgroup or mailing list (may also be called "a post") or the act of sending it. Distinguished from a "letter" or ordinary electronic mail message by the fact that it is broadcast rather than point-to-point. It is not clear whether messages sent to a small mailing list are postings or e-mail; perhaps the best dividing line is that if you don't know the names of all the potential recipients, it is a posting.
(1.) A runner, or courier, for the rapid transmission of letters, etc. (2 Chr. 30:6; Esther 3:13, 15; 8:10, 14; Job 9:25; Jer. 51:31). Such messengers were used from very early times. Those employed by the Hebrew kings had a military character (1 Sam. 22:17; 2 Kings 10:25, "guard," marg. "runners"). The modern system of postal communication was first established by Louis XI. of France in A.D. 1464. (2.) This word sometimes also is used for lintel or threshold (Isa. 6:4).