Okay, which is basically what I said (except that the original email doesn't come to your server, but to another server). The point being, all the thousands of bounced messages still come to your server. Isn't that what the whole problem is? How would you block all those thousands of bounced messages from coming at your server?
Well, there are a number of problems involved. If your server is the vulnerable one (IMail isn't vulnerable), the main issue is the outgoing bandwidth that would be wasted, and the resources on the mailserver. But that's the almost the same thing that would happen during a DoS attack (except outgoing bandwidth would be higher than a typical DoS attack).
If your server is not the vulnerable one, then you may receive thousands (or more) bounce messages to E-mail that you didn't send out. But, that's something that has been going on for many years.
So there is nothing new to this as far as IMail is concerned. In this case, you could just block the IP(s) of the servers that are being abused.
-Scott
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