Send all recipients to DSPAM.

def envrcpt(self, rcpt, *params):
        """
        Send all recipients to DSPAM.

        """
        if rcpt.startswith('<'):
            rcpt = rcpt[1:]
        if rcpt.endswith('>'):
            rcpt = rcpt[:-1]
        if self.recipient_delimiter_re:
            rcpt = self.recipient_delimiter_re.sub('', rcpt)
        if rcpt not in self.recipients:
            self.recipients.append(rcpt)
            logger.debug('<{}> Received RCPT {}'.format(self.id, rcpt))
        return Milter.CONTINUE