Allow external forwarding

  1. Go to protection.office.com
  2. Threat management > Policy
  3. Expand and exit the Outbound spam filter policy
  4. Select automatic forwarding and change to requirement.

The available values are:

  • Automatic – System-controlled: Allows outbound spam filtering to control automatic external email forwarding. This is the default value.
  • On: Automatic external email forwarding is not disabled by the policy.
  • Off: All automatic external email forwarding is disabled by the policy.

https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/configure-the-outbound-spam-policy?view=o365-worldwide

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