A mark made on a letter or package by the postal service to show the date and place of mailing.

डाक चिन्ह

English Usage: The postmark on the envelope showed that it had arrived two days late.

Hindi Usage: लिफाफे पर डाक चिन्ह इस बात को दर्शाता था कि यह दो दिन लेट आया था।