This message was not processed because it contains an invalid reci

[Jason]

I am using Outlook 2007 sp1, and pop3 mail from XO communications. There is
one sender that sends me many emails everyday. Most of his emails come
through with no problem. But usually 1 or 2 a day give me the following error.

"This message was not processed because it contains an invalid recipient"

Then the rest of the message filled with random characters. I have googled
this and have only seen a couple of posts about this.

Also if I check it on my pop3's webmail before I download it, I can see it
no problem.

Any ideas?