<messaging> To send a message to a mailing list or newsgroup. Usually implies that the message is sent indiscriminately to multiple users, in contrast to "mail" which implies one or more deliberately selected individual recipients.
You should only post a message if you think it will be of interest to a significant proportion of the readers of the group or list, otherwise you should use private electronic mail instead. See netiquette.
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Nearby terms: POSIX « POSIX Threads « POST « post » postcardware » posted write-through » Postel, Jon