Products.mailhost

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- Add support for Python 3.9 and 3.10.

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- Use standard conforming ``\r\n`` line endings.
This may require adaptations in testsSupport messages with line separation ``\r\n``
(`35 <https://github.com/zopefoundation/Products.MailHost/issues/35>`_).

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- We depend on ``zope.sendmail >= 5.1``.

- Support messages with explicit ``Content-Transfer-Encoding: 8bit``
(`30 <https://github.com/zopefoundation/Products.MailHost/issues/30>`_).

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- Fix DeprecationWarnings from ``DocumentTemplate`` with import changes

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- Show a hint in the ZMI if the delivery queue is forced to queue-only mode
(`25 <https://github.com/zopefoundation/Products.MailHost/issues/25>`_)

- Improve the asynchronous delivery information on the ZMI Edit tab
(`24 <https://github.com/zopefoundation/Products.MailHost/issues/24>`_)

- Fix queued mail delivery with just a single string receiver email
(`26 <https://github.com/zopefoundation/Products.MailHost/issues/26>`_)

- Fix Flake8 issues.
(`22 <https://github.com/zopefoundation/Products.MailHost/issues/22>`_)

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- Do not start QueueProcessorThread on configuration update.
(`14 <https://github.com/zopefoundation/Products.MailHost/issues/14>`_)