outlook 2003 "on behalf of" blank message

I have email service with msn.com. The emails on the msn server are ok. But when I download some html email messages using Outlook 2003, the emails appear with "on behalf of" the sender at the top of the email, and the email message has been blanked out.

Any ideas?

 

that sounds like spam. I get blank emails on my throwaway spam account that I use for usenet. "on behalf of" means, I believe, that the from address is different than the sender address, in the email headers.