I'm trying to switch my postfix configuration from accepting mail directly, to pointing my MX record to a different host and then only accepting mail coming in from that MX host. So far, that's only resulted in mail being rejected.
Steps taken:
Change MX record to point to external mail forwarding host
Add ip addresses for mail forwarding host to my_networks
Set smtp_client_restrictions = permit_mynetworks, reject
main.cf
? What's the reason it gives for the reject?