How does "Limit IP Address Tracking" work?
I can find no information on Apple regarding this feature, other than some mention of it regarding email. I did not find it in mail. I found it in sys pref>Network.
Mac mini, macOS 10.14
It routes your external email content through aggregated and obfuscated servers. That way, everybody is using the same IP address so they can’t tell it is you.
However, I wouldn’t put too much trust in this system. It is trivially easy to include unique URLs in your e-mail so that you can be individually tracked, regardless of your IP address.