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