Reporting-MTA: dns; a8-30.smtp-out.amazonses.com

Action: failed
Final-Recipient: rfc822; xxxxxxxx@xxxxx.xx
Diagnostic-Code: smtp; 550-5.7.1 The user or domain that you are sending to (or from) has a policy that
 550-5.7.1 prohibited the mail that you sent. Please contact your domain
 550-5.7.1 administrator for further details. For more information, go to
 550 5.7.1  https://support.google.com/a/answer/172179 af79cd13be357-8cd6f5a1b50si549015685a.437 - gsmtp
Status: 5.7.1