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posting n.
Noun corresp. to v. [post] (but note that [post] can be nouned). Distinguished from a `letter' or ordinary [email] 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 email; perhaps the best dividing line is that if you don't know the names of all the potential recipients, it is a posting.
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