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Forwards Defaults

By default, you CANNOT auto-forward MS365 emails externally as of September 2020.

Three settings are available:

  • Automatic: Automatic external forwarding is blocked. Internal automatic forwarding of messages will continue to work. This is the default setting.

  • 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.

More details in https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/external-email-forwarding?view=o365-worldwide

Default setting will block an attempted external forward and yield this error:

    5.7.520 Access denied, Your organization does not allow external forwarding. Please contact your administrator for further assistance. AS(7555)