Uses the input data to recover the original payload (includes
        transparency support as specified in RFC 821, Section 4.5.2).

def _remove_leading_dots_for_smtp_transparency_support(self, input_data):
        """Uses the input data to recover the original payload (includes
        transparency support as specified in RFC 821, Section 4.5.2)."""
        regex = re.compile('^\.\.', re.MULTILINE)
        data_without_transparency_dots = regex.sub('.', input_data)
        return re.sub('\r\n', '\n', data_without_transparency_dots)