K-9 Mail aikace-aikacen imel ne mai zaman kansa don tsarin aiki na Android. Ana samar dashi azaman Software na Kyauta/Buɗewa tushen Android ƙarƙashin lasisin Apache-2.0. Ana siyar da shirin azaman ƙarin aiki don maye gurbin tsoffin saƙon saƙon da aka haɗa akan yawancin wayoyi. Yana goyan bayan akwatunan saƙo na POP3 da IMAP kuma yana goyan bayan IMAP IDLE don sanarwa na ainihin lokaci.