Reporting-MTA: dns; quesabes.org
X-Postfix-Queue-ID: A5140ACAD6
X-Postfix-Sender: rfc822; xxxxxxxxxxxxxxxxxxxxxxxx@xxxxxxxx.xxx
Arrival-Date: Tue, 17 Oct 2017 01:53:45 +0000 (UTC)

Final-Recipient: rfc822; xxxxx.xxx@xxxxxxxxxxxx.xxx.xx
Action: failed
Status: 5.7.1
Remote-MTA: dns; ASPMX.L.GOOGLE.COM
Diagnostic-Code: smtp; 550-5.7.1 [2600:3c01::f03c:91ff:fe73:e72b] Our system
    has detected that this 550-5.7.1 message does not meet IPv6 sending
    guidelines regarding PTR records 550-5.7.1 and authentication. Please
    review 550-5.7.1  https://support.google.com/mail/?p=IPv6AuthError for more
    information 550 5.7.1 . l91si5379738plb.678 - gsmtp