[1.8.x] Fixed #24659 -- Clarified docs of smtp.EmailBackend parameters.

.. class:: backends.smtp.EmailBackend([host=None, port=None, username=None, password=None, use_tls=None, fail_silently=False, use_ssl=None, timeout=None, ssl_keyfile=None, ssl_certfile=None, **kwargs])

    This is the default backend. Email will be sent through a SMTP server.

    The server address and authentication credentials are set in the

    :setting:`EMAIL_HOST`, :setting:`EMAIL_PORT`, :setting:`EMAIL_HOST_USER`,

    :setting:`EMAIL_HOST_PASSWORD`, :setting:`EMAIL_USE_TLS`,

    :setting:`EMAIL_USE_SSL`, :setting:`EMAIL_TIMEOUT`,

    :setting:`EMAIL_SSL_CERTFILE` and :setting:`EMAIL_SSL_KEYFILE` settings

    in your settings file.

    The value for each argument is retrieved from the matching setting if the

    argument is ``None``:

    * ``host``: :setting:`EMAIL_HOST`

    * ``port``: :setting:`EMAIL_PORT`

    * ``username``: :setting:`EMAIL_HOST_USER`

    * ``password``: :setting:`EMAIL_HOST_PASSWORD`

    * ``use_tls``: :setting:`EMAIL_USE_TLS`

    * ``use_ssl``: :setting:`EMAIL_USE_SSL`

    * ``timeout``: :setting:`EMAIL_TIMEOUT`

    * ``ssl_keyfile``: :setting:`EMAIL_SSL_KEYFILE`

    * ``ssl_certfile``: :setting:`EMAIL_SSL_CERTFILE`

    The SMTP backend is the default configuration inherited by Django. If you

    want to specify it explicitly, put the following in your settings::