[issue21725] RFC 6531 (SMTPUTF8) support in smtpd

[Milan Oberkirch]

Milan Oberkirch added the comment:

Thanks for the review and improvements!

I fixed the warnings (didn't see them with running tests as described in the dev guide; I may improve that later), updated the docs to RFC 5321 (issue 19679 is referring to RFC 3463 which is not required/updated/obsoleted by RFC 5321), and fixed the _print_message method of the DebuggingServer.

Testing DebuggingServer seems difficult because it prints to stdout so I'm just checking that no exceptions are raised.

I'm aware of the maximum command length thing but would fix it in issue 21783 (because it becomes a bug when dealing with that).

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Added file: http://bugs.python.org/file36149/issue21725v5.patch

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