[exim] configuring multiple MTAs

Hi,

I want to run exim4 in more than one machines in following manner:

                     MTA-1
                  *   *    *
                *     *        *  
         MTA-2  *  *  MTA-3  * *  MTA-4
          *            *          *
            *        *   *      *              
               MTA-5   *    MTA-6

User of MTA5 wants to send mail to user of MTA1. MTA5 can do it directly or can ask any one of the intermediate MTAs to pass on the mail so that it finally reaches MTA1. Say, for example,

MTA-5--> MTA-6---> MTA-3---->MTA-2--->MTA-1 OR MTA-5---> MTA-3---->MTA-1

Similar, if user of MTA-1 sends mail to MTA-5.


Can this be achieved by Exim4. If yes then how do I configure all the MTAs? Do I have to run a DNS (BIND) on each machine?

Please help

Thanks
Asutosh



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