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by eddieroger 583 days ago
In theory, mail should be stateless, so what would they use to do that? Some clients and servers understand headers for thread identifiers, and then it would be possible to (in theory) zap that id, but all it takes is one client not supporting it for that to be out the window. The article kind of points this out - Exchange had a mitigation, but the clients got the notification and were able to reply because by then the mail was on the client (pushed).