Domestic mail encompasses items sent to which of the following destinations?

Domestic mail includes items sent to locations within the same country, specifically excluding international addresses. Military addresses, though they may involve members stationed abroad, are still treated as domestic mail when using specific military mail services, such as the United States Postal Service's Military Post Office. This is because these addresses are allocated to military personnel by the postal service, allowing mail to be processed and delivered as if it were being sent within the country.

Items sent to corporate offices can be included under domestic mail, but they do not specifically denote the nature of the destination like military addresses do. Additionally, PO Boxes are certainly a valid destination for domestic mail, but they represent only a segment of the broader category of domestic destinations and do not encompass the entirety of domestic mail. Therefore, military addresses are the most precise answer to reflect the scope of domestic mail.