This is an increasing problem over the Internet. What has most likely happened is someone is infected with a virus or spyware that has your email address in their computer. Their computer is now sending out it's payload as you. But you get the returned blocks and error. Unfortunately, there is not much you can do since it's the other culprit responsible. You can, however, simply block the return from a specific user in your EdgeWave (now known as GoSecure) filters.
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