Human mail is the transportation of a person through the postal system, usually as a stowaway. While rare, there have been some reported cases of people attempting to travel through the mail.
More common, at least in popular fiction, is the mailing of a part of a person, often a kidnap victim.
Real occurrences
Henry Brown (age 42), an African-American slave from Virginia, successfully escaped in a shipping box sent north to the free state of Pennsylvania in 1849. He was known thereafter as Henry "Box" Brown.[3]
W. Reginald Bray mailed himself within England by ordinary mail in 1900 and then by registered mail in 1903.
Suffragettes Elspeth Douglas McClelland and Daisy Solomon mailed themselves successfully to the then Prime Minister of the United Kingdom, H. H. Asquith at 10 Downing Street on 23 February 1909, but his office refused to accept the parcels.
Reg Spiers mailed himself from Heathrow Airport, London, to Perth Airport, Western Australia, in 1964. His 63-hour journey was...