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- Add minimal savepoint support, so we do not fail if any code tries to create a savepoint.
(`35 <https://github.com/zopefoundation/zope.sendmail/issues/35>`_).
- Fix TypeError: 'error' object is not subscriptable during error handling on
Windows (`33 <https://github.com/zopefoundation/zope.sendmail/pull/33>`_).
- Add support for Python 3.9.