Looking at the digest source mail header lines should get you a step in the right direction.

Cheers, Wayne

On Fri, Jul 1, 2011 at 12:12 PM, Randy Klumph <[log in to unmask]> wrote, in part:
A Reply (as well as Reply All) to Digest messages contain the following weird address, along with the proper list or personal address depending on Reply-To=

" "@wou.edu
...


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