Hoho easy boys, i am a newbee.

Where can i find rcpthosts and goodrcpt and when i reboot, the new configuration stays active?
What must i install or do with both servers?
And when one server is completely down the other server catch the mail automatically and send it automatically to the first server when it comes up again?
"How frequent and long are the outages"
It is for playing safe, we don't wanna lose incoming emails.