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I believe the case of "IMPLEMENTATION" should be treated differently.
It is not helpful at all to split the argument. It is meant to be a
text string and ['INN', '2.6.0', '(20101101', 'prelease)'] does not
have much meaning...
Suggestion:
 if line.startswith("IMPLEMENTATION"):
 name, *tokens = line.split(None, 1)
 else:
 name, *tokens = line.split()
or something else, though I do not believe another keyword will begin with "IMPLEMENTATION"...
Besides, shouldn't it be checked that the line is not empty, before splitting it?

Rather than special casing the dict item, I would rather add an "nntp_implementation" attribute containing the desired value.
> Besides, shouldn't it be checked that the line is not empty, before
> splitting it?
If the line is empty, the server is non-conformant. Then it's a matter of taste whether all errors should be wrapped in higher-level exceptions; I tend to think it's useless clutter.

The "nntp_implementation" attribute would be great.
OK for the exception.

I've committed the new attribute in r86213.