As far as I understand, every field defined in these RFCs can be used 0 or 1 time in an article, except for Comments: and Original-Sender: which can be used an unlimited number of times.I haven't checked RFC 5322 for the headers defined there, but that sounds right.Regarding Original-Sender:, isn't one time enough?Normally, yes, but it wouldn't be in pathological gatewaying situations where an article was gatewayed multiple times.
OK, thanks Russ. I have just implemented the required change in the latest development version of INN so as not to mention these two headers (otherwise, multiple occurrences are not allowed). -- Julien ÉLIE « Rien ni personne n'a tout à fait tort : même une horlogearrêtée a raison deux fois par jour. » (John Steinbeck)