Reporting-MTA: dns; bittern.ukcod.org.uk Action: failed Final-Recipient: rfc822;xxxxxxx@xxxxxxxxxx.xxx Status: 5.0.0 Remote-MTA: dns; aspmx.l.google.com 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, please visit 550 5.7.1 https://support.google.com/a/answer/172179 s12si11688866wrp.99 - gsmtp