The original message was received at Tue, 15 Dec 2015 07:27:18 +0300 from 64.238.63.138 ----- The following addresses had permanent fatal errors ----- dev at openvswitch.org ----- Transcript of the session follows ----- ... while talking to openvswitch.org.: >>> RCPT To:<dev at openvswitch.org> <<< 550 5.1.1 <dev at openvswitch.org>... Invalid recipient