Enable Automatic External Forwarding for All Mailboxes

Log in to your Office 365 Security & Compliance portal for Microsoft 365 and choose Threat management > Anti-spam or head directly to the Anti-spam settings page here: https://protection.office.com/antispam

2Click the down arrow next to Outbound spam filter policy ‎(always ON) and click the Edit policy button.

3Click the down arrow next to Automatic forwarding, then choose On – Forwarding is enabled from the dropdown. Click Save

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