[Exim] deliver to two different servers

Hello,


I am trying to figure out how to deliver mail to two
different servers for the same domain. I tried different
things with different directors but could not get it working.
I tried looking in the FAQ but couldn't find an answer.

I want to take mail from customer.com and deliver
it to both mail1.customer.com and mail2.customer.com

mail1.customer.com is running Exim so I thought I would
just point the MX to mail1 and use mail1 to forward to mail2.

Any ideas??
Thanks.