[exim] Backscatter - NDR Spam

Hi all,

I have only recvently become aware of 'Backscatter, or NDR spam.

My system uses exim. I have the stock check_rcpt_acl, along with several
routers and transports that support virtual pop and virtual aliases.

Each domain on my server has its own IP address.

I was wondering if there is an addition to the check_rcpt_acl that can be
added to elimate the NDR spaming tecnique.

Also, how does one elimiate bounces in Exim, and just reject the mail
altogether?

-Grant