Because i was doing mail server re-configure, some mail was bounce. Sorry for about that. Exactly the message-id is <20230331010404.59B87223365 at sharky4.deepsoft.com>. Again sorry for my poor work. Sincerely, Byung-Hee (Ubuntu 18.04 user) -- ^고맙습니다 _地平天成_ 감사합니다_^))//