The original message was received at Fri, 6 May 2016 16:40:46 +0800 from 27.72.190.165 ----- The following addresses had permanent fatal errors ----- <dev at openvswitch.org> ----- Transcript of the session follows ----- ... while talking to mail server openvswitch.org.: >>> RCPT To:<dev at openvswitch.org> <<< 550 MAILBOX NOT FOUND