[exim] Strip Headers

We are using third party program that uses information in a header. When
email gets relayed the header contains two or more "Received" sections.
The problem is that the program gets triggered by the "for a@???"
within the header.

Received: from [IP]
         by server
         id hgsdvhs
         for a@???

How could I get these stripped from the header so that only one remains?
Thanks
Paulo