ietf-nntp Mandatory and optional commands

[Clive D.W. Feather]

Charles Lindsey said:
>> LIST EXTENSIONS has a 500 response listed. That is surely wrong, even if
>> the command isn't provided. Or is it intended ?
> It is intended (see last sentence of 8.1.1).
> In effect, the LIST EXTENSIONS command is itself an extension :-( .

But LIST is mandatory, so the correct generic response is 501.

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