Routing inbound email to multiple email servers
I have recently setup a new mail server and have simulated sending and receiving on the new email server. The new email server will replace the primary one.
I would like to setup the new email server in parallel with the existing one.This way i can observe issues that might occur and be aware of what could go wrong. I want to received mail to be delivered to both mail servers at the same time.
I would like to use postfix, exim i find a bit to difficult to understand.
I have thought of using transport maps, the only problem is that you can only forward mail to one server at a time using transport maps.
I think recipient_bcc_maps and sender_bcc_maps could work, i would just like ideas of how i can do this.