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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.