But since the subject that you are receiving is "undeliverable : RE: Details" isn't that his server is just returning the message Unless the virus has more subjects then the list of subjects that I am aware of.
Comparing it to the headers generated by the copies of Sobig.F we've looked at, it appears that it was indeed a bounce message.
However, the fact remains that there was a virus in the bounce message, so they were spreading the virus.
Fortunately, IMail won't do this. If an E-mail is sent to an address that doesn't exist, IMail will reject the E-mail. It would then be up to the remote mailserver to generate the bounce message.
-Scott
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