Mark Brader:
This would be desirable if the poster could be notified just once, or
a small number of times, but there is no way to enforce this.  An article
may enter the network through a chain of sites, each feeding just one
other, or it may immediately reach a site that feeds it to a large number
of others, and there's no way to tell what software the other sites that
processed it were using.  Thus, there'd be no way to tell whether an
earlier site on the path, or 200 other sites served by the same feed,
had already mailed such a diagnostic.

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