What type of mail is sent outside the United States, its territories, and possessions?

International Mail is the correct answer because it refers specifically to mail that is sent to recipients located outside the borders of the United States, including its territories and possessions. This category covers a wide range of mail services that facilitate the transmission of letters, packages, and other items to different countries, ensuring that items can be correctly processed and delivered according to international shipping regulations.

Domestic Mail, on the other hand, pertains to mail that is sent and received within the United States and its territories. Military Mail relates specifically to mail sent to or from military personnel, often involving special handling and considerations. Standard Mail is a service used primarily for bulk and promotional mailing within the domestic context and is not designed for international delivery. Therefore, the distinction lies in the geographical scope of the mail service being considered, making International Mail the correct choice for mail sent outside the U.S.