mirroring email server

[Glen Gold]

Hello  gentle friends,

I require info about mirroring an email server and its obvious inclusion
within DNS records. If the question is tedious to some, accpet my
apologies, and simply point me to somewhere where I'm able to find the
answer ;)

Scenerio : 2 mail servers, I want incoming mail to be duplicated to either
server.This should not be done from primary mail server as the load is
uneccessary. An entry within DNS should be sufficient.

I appreciate your time and thank you in advance for taking the time to
answer this query.

Muju.