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I haven't get in this particular situation but one question comes to mind: are you using IPv6? To me it has been a source of problems. I just disable it. oscar On 3/19/2014 4:19 PM, Steven M. Plemmons wrote: > 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. > -- Oscar Castaņeda Remote Sensing & GIS Michigan State University