you probably got me wrong. I’m aware of the aspect you are describing, but this is not my issue.
More likely my subject was misleading.
My problem is: mailcow needs to use a smarthost to deliver mails to the Internet !
And in order to keep comunication between my internal domains (same LAN segment) I need to setup a routing like:
If destination is dom1 (on mailcow), then deliver to mailbox.
If destination is dom2 - dom5, then relay to Exchange using transport map.
If destination is Internet, then deliver to smarthost at my provider’s site.
So I need to know 2 things:
#1 How to setup mailcow, so all outbound mail is delivered to my provider’s smarthost?
#2 How to configure mailcow, so the routing above works?
Cancel my last, I got confused with the two threads.