[issue32657] Mutable Objects in SMTP send_message Signature

[Chason Chaffin]

Chason Chaffin <chason at gmail.com> added the comment:

I'm writing a PR for this right now. Is it worth it to write a test to make sure that mail_options isn't being mutated or is it enough just to update the code to use non-mutable defaults? Interesting side effect of looking into this is #32663 where I found the tests for the UTF8 code weren't being run.

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<https://bugs.python.org/issue32657>
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