Fixed #13471 -- Added example of send_mass_mail usage. Thanks to gtaylor for the report and patch.

``recipient_list`` will all see the other addresses in the e-mail messages'

"To:" field.

For example, the following code would send two different messages to

two different sets of recipients; however, only one connection to the

mail server would be opened::

    message1 = ('Subject here', 'Here is the message', 'from@example.com, ['first@example.com', 'other@example.com'])

    message2 = ('Another Subject', 'Here is another message', 'from@example.com', ['second@test.com'])

    send_mass_mail((message1, message2), fail_silently=False)

send_mass_mail() vs. send_mail()

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