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Hi Steve,

We ran into this a few weeks back.  Assuming you are not using native IPv6 in your environment what is happening is Exchange is putting the local link IPv6 address of the server into the message header.
Google checks this and sees it’s not a proper native IPv6 address and blocks the message.

The fix for us was to disable IPv6 in the registry on our Exchange server until we are ready to go to true IPv6.
See the "for more information" section at this link   http://support.microsoft.com/kb/929852
After making the registry change and rebooting the IPv4 address was showing in the message headers and google allowed mail normally.

Proceed with caution though as others online have ran into issues after disabling IPv6, also from what I have read DO NOT uncheck IPv6 on the network adapter as the registry is the proper place.





 


MSU Helmet Josh Rush
Server/Network Administrator
Advancement Information Systems & Donor Strategy
Michigan State University
University Advancement
535 Chestnut Road, Room 300
East Lansing, MI  48824-3482

Direct:  517-884-2501
Office Fax:  517-884-1219

Visit us at http://advancement.msu.edu/

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-----Original Message-----
From: Steven M. Plemmons [mailto:[log in to unmask]]
Sent: Wednesday, March 19, 2014 4:20 PM
To: [log in to unmask]
Subject: [MSUNAG] Google Blocking E-mail - IPv6 error

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


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