troubleshooting Question

spam Subject: ???????????? The following recipient(s) could not be reached:

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mrmythFlag for United States of America asked on
Anti-Virus AppsAntiSpamOS Security
5 Comments1 Solution303 ViewsLast Modified:
user is getting a lot of spam with the following content

"The following recipient(s) could not be reached: on 8/7/2008 5:32 AM
  The e-mail system was unable to deliver the message, but did not report a specific reason.  Check the address and try again.  If it still fails, contact your system administrator.
  < #5.0.0>"

Is this just a flood of spam or could this be a legit problem. The user never sent an email to the address this email mentions.

Is there something that can or needs to be done besides eliminating this content with a rule?

(I X'd out the actual address it said because I didn't want to put the real address it says on the interent.)
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