This is the mail system at host emkei.cz. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to postmaster. If you do so, please include this problem report. You can delete your own text from the attached returned message. The mail system <ozzy6669@docomo.ne.jp>: host mfsmax.docomo.ne.jp[203.138.180.240] said: 550 Unknown user ozzy6669@docomo.ne.jp (in reply to RCPT TO command) Reporting-MTA: dns; emkei.cz X-Postfix-Queue-ID: 85DCAD5DC4 X-Postfix-Sender: rfc822; Arrival-Date: Fri, 24 Mar 2017 13:39:50 +0100 (CET) Final-Recipient: rfc822; ozzy6669@docomo.ne.jp Action: failed Status: 5.0.0 Remote-MTA: dns; mfsmax.docomo.ne.jp Diagnostic-Code: smtp; 550 Unknown user ozzy6669@docomo.ne.jp From: "テスト" Date: 2017年3月24日 21:39:50:JST To: ozzy6669@docomo.ne.jp Reply-To: