3 ms·

I don't see what the issue with uniquely identifying a system is. The main metadata of concern is what other mail servers are being interacted with.

• johntash 8y ago
  If everything has to go through their relay, they can pretty easily see what mail servers are being interacted with.
  • newman314 8y ago
    Thanks. Please see my other questions here. https://news.ycombinator.com/item?id=18243685 https://news.ycombinator.com/item?id=18243685
  • ryan-c 8y ago
    Yes, but they don't have to log that, and given the way the system is described there's no reason it would by default.