mailable matter
mailable matter (1)(符合邮政法规定的)可邮寄物品 (2)适合信差收取或投递的邮寄件
mailable, adj. (Of a letter or package) lawful to send through a postal service. [Cases: Postal Service 13. C.J.S. Postal Service and Offenses Against Postal Laws §§ 6, 15.]
nonmailable, adj. Of or relating to a letter or parcel that cannot be transported by mail for a particular reason such as the package’s size, contents, or obscene label. [Cases: Postal Service 14. C.J.S. Postal Service and Offenses Against Postal Laws §§ 15–17.]