On 22.07.2020 18:28, jr wrote:
> so my understanding of NNTP is that once a post has "gone through", it will
> remain on that server indefinitely

No, NNTP explicitly permits to cancel messages. While GUI clients limit 
this ability somewhat for the "simple" user, there is no check as long 
as the sender address matches. So you can actually cancel any message.

Thorsten

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