:param bcc: Email addresses for the 'Bcc' API field.
        :type bcc: :keyword:`list` or `str`

def bcc(self, bcc):
        '''
        :param bcc: Email addresses for the 'Bcc' API field.
        :type bcc: :keyword:`list` or `str`
        '''
        if isinstance(bcc, basestring):
            bcc = bcc.split(',')
        self._bcc = bcc