[issue21935] Implement AUTH command in smtpd.

[R. David Murray]

R. David Murray added the comment:

Describing how a programmer would implement authentication is exactly the API I was referring to, and that includes the signature and semantics of _verify_user_credentials.

I agree that (1) seems the cleanest.  I'd favor 1.1, NotImplemented, which lets the programmer see immediately what they did wrong.

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<http://bugs.python.org/issue21935>
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