code: def matches_address(self, address):
          
          if self.address == address:
              return True
          for alias in self.aliases:
              if alias == address:
                  return True
          if self._alias_regexp and self._alias_regexp.match(address):
              return True
          return False
docs: returns whether this account knows about an email address
  
          :param str address: address to look up
          :rtype: bool