[issue32975] mailbox: It would be nice to move mailbox.Message from legacy email.message.Message API to new EmailMessage API

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

This is a reasonable request (a good way to use EmailMessage), but EmailMessage is not yet the default even for the email package.  You have to specify policy=default to get it (or use it to construct a message).

Mailbox probably needs some backward compatible way for the user to specify the policy.

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versions: +Python 3.8 -Python 3.6

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