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
This problem is related to IPv6, the message header contains an IPv6 address and Gmail attempts to authenticate the shipping address.
Solution 1 :
- Disable IPv6 on network cards
Solution 2 :
- Enter the following commands to disable ISATAP cards:
netsh int ipv6 isatap set state disabled netsh int ipv6 6to4 set state disabled
Solution 3 :
If the problem persists, stop the IP Support service (iphlpsvc) and switch to manual startup.