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Python2 is EOL. We does not support Python 2.7.x

@corona10
Python 2 EOL: We will have to work with python 2.7.x for many more years ...
Why refuse to have only one version of smtplib.py to maintain ...

I believe this should be split into two pull requests – one fixing a bug and another improving backward compatibility. Right now I can barely see what the actual fix is here.

But on the backward compatibility front:

Why refuse to have only one version of smtplib.py to maintain ...

I'd say because it may add a maintenance burden (arguably not in this case) or affect the code negatively (like initial_response_ok losing its keyword-only designation in this patch).

Ok, I drop the backward compatibility...
I corrected the bug link: https://bugs.python.org/issue36094
I create 2 files, one for python 2 and one for python 3, available on the following links:
https://github.com/prrvchr/cpython/blob/2.7/Lib/smtplib.py
https://github.com/prrvchr/cpython/blob/3.9/Lib/smtplib.py
You are free to take care to merge these changes, that in me I use these modified versions ...

In general, a pull request should be created against the master branch and manually backported if the automatic backpot fails.

This is the project policy.

2.7 branch is frozen and doesn't accept any change, sorry.

I'm closing this PR; it removes all audit calls which is not acceptable.