@firstname.lastname@example.org I think it just searches Google on your behalf and scrapes the page for results.
@email@example.com That’s covered in the fine print. You could route it through a remote server, but even if you don’t you still get the other benefits like no AMP links and DDG-style !bangs.
- No tracking/linking of your personal IP address***
***If deployed to a remote server, or configured to send requests through a VPN, Tor, proxy, etc.