def has_address(self, address):
        
        if self.filter(to_address=address).count() > 0: # @@@ is there a better way?
            return True
        else:
            return False
is the given address on the don't send list?
dataset/ETHPy150Open brosner/django-mailer/mailer/models.py/DontSendEntryManager.has_address