And here's what one nice person told me:
Quote:
News has a well-defined protocol (NNTP - RFC977 etc) and if you have a program which retrieves and/or send articles then it should retain the very important "Message-ID" header which each article contains. Then if it accidentally tried to post an old article it would get rejected because of the conflicting Message-ID (unique for each article). Otherwise it would generate a unique Message-ID for a new article and present it with the "IHAVE" nntp command.
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*sighs*