Warning: Unable to process data

I am getting the following warning message in a number of my messages:

        Unable to process data:
multipart/mixed;boundary="-----=_Next_Item:A3CB49KFSA19" 
and none of the message body shows up.  What might be causing this?

Thanks

Randy Blaustein
Systems Administrator
Armed Forces Emergency Services Center
American Red Cross
blausteinr(_at_)usa(_dot_)redcross(_dot_)org
(703) 206-6799

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