Both Air and Surface Transportation is available to most countries for all types of international mail.
International mail consists of three categories of mail.
Each category is defined below. This type of mail compares to U.S. Domestic first-class mail. This group consists of letters, letter packages, aerogrammes, and post cards. Letters and letter packages are items of mail containing personal handwritten or typewritten communications having the character of current correspondence. Unless prohibited by the country of destination, merchandise or other articles within the applicable weight and size limits may also be mailed at the letter rate of postage.