Suddenly, google is blocking messages sent from our exchange server to gmail addresses. The following error message is given. Is anyone else seeing this?
Thanks,
Steve Plemmons
Systems Analyst II/S
Department of Mathematics
Michigan State University
619 Red Cedar Road
C339 Wells Hall
Office: 517-353-4673
[log in to unmask]
mx.google.com gave this error:
[2002:2308:4821::2308:4821] Our system has detected that this message does not meet IPv6 sending guidelines regarding PTR records and authentication. Please review https://support.google.com/mail/?p=ipv6_authentication_error for more information. l7si4236735icq.11 - gsmtp
Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept e-mail from certain senders, or another restriction may be preventing delivery.
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