Stamp is a prepaid postage certificate issued by the postal administration of a country (region).

邮票，是指由国家(或地区)邮政主管部门发行的预付邮资凭证。

youdao

Payments must be made in U.S. dollars by a bank draft drawn to the order of the United Nations Postal Administration.

付款必须用开给联合国邮政管理处的银行汇票，并以美元支付。

《柯林斯英汉双解大词典》

He said that since taking office in January, the Obama administration has eased various restrictions and opened new dialogue on migration and postal links.

VOA: standard.2009.10.28

Bailouts are continuing with the Postal Service, Federal Housing Administration, Pension Benefit Guaranty Corporation, and more.

FORBES: Forget The Fiscal Cliff, But Fear The Looming Debt Crisis

Under the administration's budget proposal, the Postal Service would eliminate the equivalent of 23, 579 jobs.

WSJ: Postal Service Delays Plans to End Saturday Delivery

Wednesday's budget plan from the administration urged Congress to pass legislation to reshape the Postal Service.

WSJ: Postal Service Delays Plans to End Saturday Delivery