And the problem is...?
Did the external party knowingly include the screenshot?
Is the external party using a mac? if so see
http://support.microsoft.com/?kbid=951679

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> User received an email from external party and found that the email has a
> attchment named image001.png. The image file actually is a screen capture
> picture came from her computer. That means the email from external party
> with a attachment which from her computer. Anybody has the same issues
> before and any solution?