ietf-nntp <0> and message IDs

[Clive D.W. Feather]

>> message-ids must not include the space character, either.
> "printable" doesn't include space or tab. This is made clear in the
> formal syntax; does it need to be said somewhere else as well?

Turns out it's already in there:

   A "printable US-ASCII character" is an octet in the range %x21-7E.

under, curiously enough, "Notation".

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