IP-PTR-NOT-CONFIRMED
Reverse DNS does not confirm forward
What it means
Forward-confirmed reverse DNS (the PTR name resolves back to the IP) is what receivers actually test.
How to fix it
- 1Make sure the hostname in the PTR has an A/AAAA record pointing back at the same address.
Re-check after the change
DNS changes can take up to the record's TTL to be seen; use Re-run on the result page to bypass our 10-minute cache.