Russ Allbery wrote:
news -> mail -> news gatewaying is integral to the Usenet protocol and is
actually as common if not more common than mail -> news -> mail
gatewaying, since moderation is just a special case of news -> mail ->
news gatewaying.
Although the distinction does not directly affect the issue of transformations,
technically moderation is not news->mail->news, since the proto-article
which is mailed to the moderator is not news, as it has not been injected
into the news system and lacks some news-specific headers (at least
Approved). Also, injection by the moderator is not necessarily exactly the
same as a mail->news gateway, though a moderator might use such a gateway
for that purpose. Email submission to a moderator does not require all of the
checks that are necessary for news->mail gateways w.r.t. loops etc., and
in an RFC 1036 environment there are no transformations necessary (any
minor transformations such as changinig ':' to ": " can be performed at
the time of injection). It is only the major departure from Internet
text message article format introduced by the Usefor draft's inclusion of
untagged, unencoded utf-8 that necessitates transformations during the
process of submission for moderation (and in gateways).