def parse_header_spf(self, val):
        """Set SPF values from Received-SPF header.
        
        Useful when SPF has already been run on a trusted gateway machine.

        Examples:
        >>> q = query('0.0.0.0','','')
        >>> p = q.parse_header_spf('''Pass (test) client-ip=70.98.79.77;
        ... envelope-from="evelyn@subjectsthum.com"; helo=mail.subjectsthum.com;
        ... receiver=mail.bmsi.com; mechanism=a; identity=mailfrom''')
        >>> q.get_header(q.result)
        'Pass (test) client-ip=70.98.79.77; envelope-from="evelyn@subjectsthum.com"; helo=mail.subjectsthum.com; receiver=mail.bmsi.com; mechanism=a; identity=mailfrom'
        >>> o = q.parse_header_spf('''None (mail.bmsi.com: test)
        ... client-ip=163.247.46.150; envelope-from="admin@squiebras.cl";
        ... helo=mail.squiebras.cl; receiver=mail.bmsi.com; mechanism=mx/24;
        ... x-bestguess=pass; x-helo-spf=neutral; identity=mailfrom''')
        >>> q.get_header(q.result,**o)
        'None (mail.bmsi.com: test) client-ip=163.247.46.150; envelope-from="admin@squiebras.cl"; helo=mail.squiebras.cl; receiver=mail.bmsi.com; mechanism=mx/24; x-bestguess=pass; x-helo-spf=neutral; identity=mailfrom'
        >>> o['bestguess']
        'pass'
        """
        a = val.split(None,1)
        self.result = a[0].lower()
        self.mechanism = None
        if len(a) < 2: return 'none'
        val = a[1]
        if val.startswith('('):
          pos = val.find(')')
          if pos < 0: return self.result
          self.comment = val[1:pos]
          val = val[pos+1:]
        msg = Message()
        msg.add_header('Received-SPF','; '+val)
        p = {}
        for k,v in msg.get_params(header='Received-SPF'):
          if k == 'client-ip':
            self.set_ip(v)
          elif k == 'envelope-from': self.s = v
          elif k == 'helo': self.h = v
          elif k == 'receiver': self.r = v
          elif k == 'problem': self.mech = v
          elif k == 'mechanism': self.mechanism = v
          elif k == 'identity': self.ident = v
          elif k.startswith('x-'): p[k[2:]] = v
        self.l, self.o = split_email(self.s, self.h)
        return p
Set SPF values from Received-SPF header.
        
        Useful when SPF has already been run on a trusted gateway machine.

        Examples:
        >>> q = query('0.0.0.0','','')
        >>> p = q.parse_header_spf('''Pass (test) client-ip=70.98.79.77;
        ... envelope-from="evelyn@subjectsthum.com"; helo=mail.subjectsthum.com;
        ... receiver=mail.bmsi.com; mechanism=a; identity=mailfrom''')
        >>> q.get_header(q.result)
        'Pass (test) client-ip=70.98.79.77; envelope-from="evelyn@subjectsthum.com"; helo=mail.subjectsthum.com; receiver=mail.bmsi.com; mechanism=a; identity=mailfrom'
        >>> o = q.parse_header_spf('''None (mail.bmsi.com: test)
        ... client-ip=163.247.46.150; envelope-from="admin@squiebras.cl";
        ... helo=mail.squiebras.cl; receiver=mail.bmsi.com; mechanism=mx/24;
        ... x-bestguess=pass; x-helo-spf=neutral; identity=mailfrom''')
        >>> q.get_header(q.result,**o)
        'None (mail.bmsi.com: test) client-ip=163.247.46.150; envelope-from="admin@squiebras.cl"; helo=mail.squiebras.cl; receiver=mail.bmsi.com; mechanism=mx/24; x-bestguess=pass; x-helo-spf=neutral; identity=mailfrom'
        >>> o['bestguess']
        'pass'
        
python/spf.py