> People on the Internet won't like you calling it 'exactly once delivery' because it's not exactly once That depends entirely on what you mean by "it". Messa

> People on the Internet won't like you calling it 'exactly once delivery' because it's not exactly once That depends entirely on what you mean by "it". Messages can get lost. So if you want guaranteed delivery, you sometimes have to re-transmit the same message, and so you might end up with the same message being delivered more than once. But it is trivial to put an abstraction layer on top of that to discard the duplicates and make it appear to the application as if every message is received exactly once. The whole thing is a tempest in a teapot.