Exchange: email rejected by Gmail

Symptom

Emails sent to GMAIL recipients do not receive emails.

You receive a return message of this type:

Our system has detected that this message does not meet IPv6 sending guidelines regarding PTR records and authentication

Cause

This problem is related to IPv6, the message header contains an IPv6 address and Gmail attempts to authenticate the shipping address.

Solutions

Solution 1 :

  • Disable IPv6 on network cards

Solution 2 :

  • Enter the following commands to disable ISATAP cards:

Solution 3 :

If the problem persists, stop the IP Support service (iphlpsvc) and switch to manual startup.





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