I am planning to setup redundant Postfix servers.
What is the best design for this.
I have my internal exchange servers which will relay mails to my Postfix servers.
I want to setup the Postfix servers with redundancy & load balancing.
Even if any one of the Postfix servers are down the mail flow should be via the available Postfix servers.
There should not be any down time or impact even if any of the mail servers are down.
I want to ensure that not even a single mail is dropped in case if any of the servers are down.