Zope.sendmail

================

- Use ``pywin32`` again, not any longer the meanwhile outdated fork named ``pypiwin32``.
Add some information for installation with buildout.
(`30 <https://github.com/zopefoundation/zope.sendmail/issues/30>`_)

- Support ``bytes`` messages; consistently convert messages
using a "text" type (i.e. ``str`` for Python 3, ``unicode`` for Python 2)
into ``bytes`` via utf-8 encoding.
Prerequisite to fix
`Products.MailHost30
<https://github.com/zopefoundation/Products.MailHost/issues/30>`_.

================

- Drop support for Python 3.4.

- Add support for Python 3.8a3.

- Fix text/bytes issue in MailDir for Python 3.
(`24 <https://github.com/zopefoundation/zope.sendmail/pull/24>`_)

==================

- Fix SMTP authentication on Python 3. See `issue 16
<https://github.com/zopefoundation/zope.sendmail/issues/16>`_.

================

- Add support for Python 3.7.

==================

- Host documentation at https://zopesendmail.readthedocs.io/

- Make the data manager sort key a string, this fixes Python 3 where
strings and integers are not sortable. This would happen when using
other data managers with string sort keys.

- Add support for Python 3.5 and 3.6.

- Drop support for Python 2.6 and 3.3.

- Declare explicit dependency on ``pywin32`` on Windows.

- Replace hard-coded constants with equivalents from the standard
``errno`` module.

- Fix SSL support on Python 3. See `issue 9
<https://github.com/zopefoundation/zope.sendmail/issues/9>`_.

- Reach 100% test coverage and maintain it via tox.ini and Travis CI.

- Replaced deprecated dependency on ``optparse`` with equivalent
``argparse``. The help messages have changed and errors are
generally more clear. Specifying a ``--config`` path that doesn't
exist is now an error instead of being silently ignored.

- Fix SMTPMailer sending more than one message. It now reconnects to
the SMTP server as needed. Previously it could only send one message
since it closed the connection after each send. This also makes the
SMTPMailer thread safe. See `issue 1
<https://github.com/zopefoundation/zope.sendmail/issues/1>`_.

==================

- Add support for PyPy3.