[ovs-dev] Mail System Error - Returned Mail

[MAILER-DAEMON]

This message was not delivered due to the following reason(s):

Your message was not delivered because the destination server was
unreachable within the allowed queue period. The amount of time
a message is queued before it is returned depends on local configura-
tion parameters.

Most likely there is a network problem that prevented delivery, but
it is also possible that the computer is turned off, or does not
have a mail system running right now.

Your message could not be delivered within 4 days:
Server 189.183.227.21 is not responding.

The following recipients did not receive this message:
<dev at openvswitch.org>

Please reply to postmaster at openvswitch.org
if you feel this message to be in error.