postmarked

The clerk postmarked the letter immediately after I handed it over.

用法提示：动词postmark在这里表示在信件上盖邮戳，使用过去式postmarked。

Please ensure all parcels are postmarked before the deadline.

用法提示：动词postmark使用被动语态are postmarked，表示被盖上邮戳。

She forgot to postmark the envelope, so the recipient couldn't tell when it was sent.

用法提示：动词postmark用不定式形式to postmark，表示忘记做盖邮戳这个动作。