書しょ簡かん箱ばこMeaningsNoun1. electronic mailboxKanji used書write簡simple箱boxComposed of書しょ簡かんletter; note; epistle; correspondenceNoun箱はこbox; case; chest; package; pack; crate; car (of a train, etc.); shamisen case; shamisen; counter for boxes (or boxed objects)Noun