Allowing Email forwarding to a External User | Security | Spam Policy | O365 | Exchange
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Error: Remote Server returned '550 5.7.520 Access denied, Your organization does not allow external forwarding
Office 365 Forwarding Not Working. Delivery has failed. Your organization does not allow external forwarding. 550 5.7.520 Access Denied.
As an admin, you might have company requirements to restrict or control automatically forwarded messages to external recipients (recipients outside of your organization). Email forwarding can be useful, but can also pose a security risk due to the potential disclosure of information. Attackers might use this information to attack your organization or partners.
You can use outbound spam filter policies to control automatic forwarding to external recipients. Three settings are available:
Automatic - System-controlled: This is the default setting. This setting is now the same as Off. When this setting was originally introduced, it was equivalent to On. Over time, thanks to the principles of secure by default, this setting was gradually changed to Off for all customers. For more information, see this blog post.
On: Automatic external forwarding is allowed and not restricted.
Off: Automatic external forwarding is disabled and will result in a non-delivery report (also known as an NDR or bounce message) to the sender.
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