def drop(self, ext):
        try:
            del self.extensions[ext.upper()]
            return True
        except KeyError:
            return False
There are many unimplemented fields throughout parselmouth,
dataset/ETHPy150Open slimta/python-slimta/slimta/smtp/extensions.py/Extensions.drop--crossover with--dataset/ETHPy150Open chartbeat-labs/parselmouth/parselmouth/adapters/dfp/targeting_utils.py/clean_target_dict