How does one send mail bearing self-print prepayment impressions?
A:
The mail should be posted at post office counters. It will be treated as underpaid if inserted into postal boxes without the proper amount of attached postage stamps. For domestic letter-post items over 20 pcs. per posting within the same category and at the same postage rates, the sender need only remit the total postage. The post office will then stamp a "postage paid" impression on each piece. International ordinary letter-post items are treated in an identical manner.
