[ovs-dev] Mail System Error - Returned Mail

[Mail Delivery Subsystem]

The original message was received at Thu, 24 Sep 2015 11:31:04 +0530 from [34.237.138.187]

----- The following addresses had permanent fatal errors -----
<dev at openvswitch.org>

----- Transcript of the session follows -----
... while talking to 53.211.198.212:
>>> MAIL From:"Mail Delivery Subsystem" <MAILER-DAEMON at openvswitch.org>
<<< 509 Refused