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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.