outbind ://19- error in outlook

when forwarding messages periodically the user recieves the outbind ://19- message attatched at the top of the out going message:outbind://19-000000004CD16D0131E3D511AC5900A0C9E587A807007595CA9D82BAD411AC5000A0C9E587A8000001966FF50000C277F437BFF4484B99529CE872D7E695000000E5E5580000/cid:002101c36cf2$4a51b4e0$6901a8c0@newthink
office XP /os=WinXP sp1
any ideas anyone?