The original message was received at Wed, 6 Apr 2016 08:37:30 +0800 from [146.106.136.6] ----- The following addresses had permanent fatal errors ----- dev at openvswitch.org ----- Transcript of session follows ----- ... while talking to 87.33.81.218: >>> RCPT To:<dev at openvswitch.org> <<< 550 MAILBOX NOT FOUND