Hello,
our Exchange 2010 Server cannot send to mx.google.com anymore.
Our mails are rejected with this error messages:
"[2002:d476:de46::d476:de46 12] Our system has detected that this message is likely unsolicited mail. To reduce the amount of spam sent to Gmail..."
So, here I can see that the IPv6 Address is blocked. But we IPv6 is still deactivated. What the Exchange Server uses is our IPv6 Adress from the 6TO4 Tunnel, which I haven't confugured.
How can I force the usage of the IPv4 address?
How can I solve this prolblem?
Kind regards