Barry Warsaw writes:

 > But it would have to be subject to the same bounce rules as any other  
 > auto-response which could be used as a spam vector, e.g. limit the  
 > number of bounces per time period and don't include the entire  
 > original message in the bounce

But that prevents detecting a prematurely sent message, which is
presumably a common use case for genuine collisions.

I just don't think bouncing back is going to be very useful; either
you don't give the user the information he needs to figure out what
happened, or you give the spammers a vector.

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