title: Unique Messages per Queue in AMQP?
body: <p>This is similar to <a href="https://stackoverflow.com/questions/1139817/amqp-delay-delivery-and-prevent-duplicate-messages">this other question</a> but with a bit of a twist: I read in the specification that the message-id for AMQP messages should be set by the application itself, so in theory I could use that to guarantee a certain degree of uniqueness, right?</p>
  
  <p>My main question is now: In what scope is that message-id garantueed to be unique? For the messages currently enqueued inside a specific queue? Over all queues? Over the universe? :-)</p>
  
  <p>And is this behaviour standardized? I plan to use RabbitMQ here, but it would be nice to have something not vendor specifc :-)</p>
  
  <p>Thanks.</p>