'Initialize a single email message (which can be sent to multiple
recipients).'

def __init__(self, subject='', body='', from_email=None, to=None, bcc=None, connection=None, attachments=None, headers=None, alternatives=None, cc=None, reply_to=None):

    super().__init__(subject, body, from_email, to, bcc, connection, attachments, headers, cc, reply_to)
    self.alternatives = (alternatives or [])
