As for spam, ISPs (including mail service providers) could limit their users to, say, 100 e-mails a day; for more, you have to pay or at least post a security bond, or pass some good behavior test.

对于垃圾邮件，网络服务商(包括邮件服务商)应该对用户有所限制，比如说每天只能发一百封邮件，更进一步说，你得付费，或至少发布安全债券，或通过一个好的行为测试才行。

youdao

'Snail mail' is the traditional letter delivering service in which you have a postman and a post box.

所谓的“蜗牛邮件”就是传统的邮寄信件，没有邮递员也没有邮箱。

youdao

At present, China Post and International Express Mail service has established business relationship with more than 200 countries and regions in the world.

目前，中国邮政国际特快专递业务已与世界上200多个国家和地区建立了业务关系。

youdao

The Postal Service also wants to shut down some post offices and cut back on funding health care for retired mail carriers.

VOA: standard.2010.04.13

Even the U.S. Postal Service closed post offices and suspended mail delivery Saturday in New England.

WSJ: Storm Sweeps Through Northeast U.S.

The U.S. Postal Service closed post offices and suspended mail delivery on Saturday in all of New England.

WSJ: Behemoth storm drops 2 feet of snow on Northeast

The Post Office thinks of itself as a mail service.

FORBES: To Avoid Collapse The Post Office Should Deliver Health Care And Other Services