Posting: N. Noun Corresp. To V. {post} (but Note That {post} Can Be Nouned).

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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.
-- The AI Hackers Dictionary

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