Django-mailer

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* Fixed rare crasher in runmailer_pg when notifications list is empty.

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* Dropped Python 3.7 support.
* Added ``runmailer_pg`` - advanced sending method for sending emails without delay
immediate, PostgreSQL only.

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* Added admin action to send messages
* Added fix for email address that is a ``NoneType``
* Stopped testing on unsupported Python (<3.7) and Django (<2.2) versions
* Started testing on Python 3.11 and Django 4.1/4.2
* Added setting to limit the amount of retries for deferred messages
(``MAILER_EMAIL_MAX_RETRIES``), defaults to ``None`` (unlimited)
(See Issue `161 <https://github.com/pinax/django-mailer/issues/161>`_)

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* Migrate models ``id`` fields to ``BigAutoField``.
* Added ``runmailer`` management command. This command starts a loop that
frequently checks the database for new emails. The wait time between
checks can be controlled using the ``MAILER_EMPTY_QUEUE_SLEEP`` setting.

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* The ``retry_deferred`` and ``send_mail`` commands rely on the log level set
in your django project now. The ``-c/--cron`` option in those commands has
been deprecated and the logic to configure log levels and the message
format has been removed.
* Changed logging to use module specific loggers to avoid interfering
with other loggers.
* Added ``MAILER_USE_FILE_LOCK`` setting to allow disabling file based locking.
* Added ``-r`` option to ``purge_mail_log`` management command. Thanks julienc91
* Fixed deprecation warnings on Django 3.1
* Use cached DNS_NAME for performance
* Added ability to override the default error handler via the ``MAILER_ERROR_HANDLER``
settings key

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* Fixed issue with migration that some people experienced (see `PR 118
<https://github.com/pinax/django-mailer/pull/118>`_)