So this weekend we started getting this error from our exchange 2010 server when email to gmail accounts
mx.google.com gave this error:
[2002:451f:c8ce::451f:c8ce 16] Our system has detected that this message does not meet IPv6 sending guidelines regarding PTR records and authentication.
wondering if anyone else has gotten this and how the resolved it.
The funny thing is our exchange server is not IPV6 enabled. It has a static IPV4 IP