relayhost

Good day, I use Proxmox to server multiple email domains. I need some advise on how to go about the following using Postfix: I have 1 domain that needs to send mail to a certain host for email branding. The rest can stay as is. How would I go about setting this up in Postfix. Please note that...

We've been using PMG for a couple of weeks but today I saw our IP address seems to be on a Microsoft blocklist - ignore this part, how to get unblocked is not the reason why I am posting. Rather, I'd like to see how to get PMG to work with selective smarthosts or possibly some other suggestions...