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--- The mail
切手 kitte stamp   Ref. 切 [cut]
手紙 tegami letter 紙 [paper]  Ref. 手 [hand]
郵便 yūbin mail service   Ref. 郵 [mail]
郵便局 yūbinkyoku post office 便 [service]  Ref. 郵 [mail]
郵便切手 yūbinkitte postage stamp   Ref. 郵 [mail]
→ 送る okuru to send | to spend time Ref. 送 [send]
→ 発送 する hassō suru to ship Ref. 送 [send]