This trick may be useful in giving you the heads up, however, I wouldn't rely on it. You should in no way trust a virus to behave in a predictable manner. Just because some email virii give up after the first address if delivery fails, you have no indication whatsoever that any other virii do too. Also, this only deals with one of the huge number of attack and replication vectors possible. It's worth doing because of its simplicity, but do NOT rely on it, and do NOT assume that you can open any email safely because you are using this trick. You should continue to be as vigilant as before, and consider yourself lucky if the trick works.

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