5.7.520 Access denied, Your organization does not allow external forwarding.
Please contact your administrator for further assistance. AS(7555)
- https://protection.office.com/antispam
- Click the down arrow next to Outbound spam filter policy (always ON) and click the Edit policy button.
- Click the down arrow next to Automatic forwarding, then choose On – Forwarding is enabled from the dropdown. Click Save.