Public DNS points at a private address
ATTENTIONWhat it means
example.com resolves to the offending value, an address that only exists inside private networks. Nobody on the internet can reach it, and publishing internal addressing in public DNS tells strangers how your network is laid out.
How to fix it
Publish the public address instead, and keep internal names on internal DNS.
Check your own domain
This page describes the condition. To find out whether your domain has it, run the A test or the full checkup, which examines every record at once.
Understand it properly
This page covers one condition. For the whole picture, Why mail lands in spam, in the order worth checking, or start at the Health Library.
Where this comes from
We judge this against RFC 1918 section 3. Every finding on this site cites the specification behind it so you can check the work rather than take our word for it.
A_PRIVATE_IP
Every fix on this site is yours to implement. If you would rather someone did it, I take this work directly.