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Don't disable IPv6 because you will create other problems. I can't remember what it breaks but have problems in the past with Exchange 2013. Matt Stehouwer Technology Manager Michigan State University College of Natural Science Deans Office 288 Farm Lane RM 154 East Lansing, MI 48824 517 355-9003 | Email: [log in to unmask] Linked-In: www.linkedin.com/in/mattstehouwer/ -----Original Message----- From: Oscar Castaneda [mailto:[log in to unmask]] Sent: Thursday, March 20, 2014 10:11 AM To: [log in to unmask] Subject: Re: [MSUNAG] Google Blocking E-mail - IPv6 error 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