[W/K] :: snail-mail

  snail-mail n. Paper mail, as opposed to electronic. Sometimes written
     as the single word `SnailMail'. One's postal address is,
     correspondingly, a `snail address'. Derives from earlier coinage
     `USnail' (from `U.S. Mail'), for which there have even been parody
     posters and stamps made. Also (less commonly) called `P-mail', from
     `paper mail' or `physical mail'. Oppose email.