Products.mailhost

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- Fix breaking sendmail tag rendering with DocumentTemplate > 3

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- Prevent ZMI blowups when pointing to a non-Maildir queue folder
(`2 <https://github.com/zopefoundation/Products.MailHost/issues/2>`_)

- Changed ZMI forms for Zope 4 ZMI compliance
(`17 <https://github.com/zopefoundation/Products.MailHost/issues/17>`_)

- Packaging and test configuration cleanup

- Add badges to the README

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- Add ability to disable sending of queued mails. Details see README.rst.
(`14 <https://github.com/zopefoundation/Products.MailHost/issues/14>`_)

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- silence deprecation warning due to non-raw regex
(`13 <https://github.com/zopefoundation/Products.MailHost/issues/13>`_)

- Specify supported Python versions using ``python_requires`` in setup.py
(`Zope481 <https://github.com/zopefoundation/Zope/issues/481>`_)

- Add support for Python 3.8

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- Add icon for Bootstrap ZMI.

- Fix start-up in case ``Products.GenericSetup`` is not installed.
(`9 <https://github.com/zopefoundation/Products.MailHost/issues/9>`_)

- Add support for Python 3.7.

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- Fix GenericSetup support for GenericSetup 2.x

- Fix DeprecationWarnings

- PEP-8 code style compliance

- Drop support for Python 3.4