How to fix 550 5.7.520 Access denied, Your organization does not allow external forwarding.
By default, Microsoft 365 Defender sets up an Anti-Spam outbound policy. And the policy default sets Automatic Forwarding to “Automatic: System Controlled.” Error: “Remote Server returned ‘550 5.7.520 Access denied. Your organization does not allow external forwarding. Please contact your administrator for further assistance. AS(7555)” Since we do not want to modify this default policy, […]