Gmail now requires SPF or DKIM: http://googleappsupdates.blogspot.nl/2016/08/making-email-safer-with-new-security-warnings-in-gmail.html
Not sure why it it calls it authenticated when it is not aligned with the 'From'-domain (like DMARC does). Technically it is, but not by the sender itself. I was hoping for a strong authentication booster ;-). Met vriendelijke groet, David Hofstee Deliverability Management MailPlus B.V. Netherlands (ESP)
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