X-Antiabuse headers

I'm using the mail function in php. Now, some of the people getting mail from this are getting all those x-antiabuse header information as part of the body for some reason.

This seems to be dependent on the clients mail server. All mail I get is fine, mail received through hotmail is fine, but other ISP's seem to be tagging that info into the body.

Anyone have an idea as to why this could be happening via certain routes?

Pete.

AOL/Walmart Connect puts all header info at the bottom of the page...which is probably mistaken for the body. You can't shut it off, either.
Those X-Antiabuse headers are lame...:D