(historical) A postal mail system used in America during World War II for correspondence with soldiers stationed abroad. Letters were censored, copied to film, and printed back onto paper at their destination.

Small-scale artworks sent through the postal service as part of a populist artistic movement.

plural of coat of mail

plural of mail relay

plural of mail truck

plural of mail merge

plural of mail train

plural of mail fraud

plural of mail carrier

plural of mail-box