Remote domains to allow or block automatic email forwarding to some or all external domains. How the outbound spam filter policy settings work with other automatic email forwarding controlsĪs an admin, you might have already configured other controls to allow or block automatic email forwarding. Automatic forwarding of messages between internal users isn't affected by the settings in outbound spam filter policies. Disabling automatic forwarding disables any Inbox rules (users) or mailbox forwarding (admins) that redirect messages to external addresses. :max_bytes(150000):strip_icc()/mail-5c942a8446e0fb0001376ecf.jpg "how to forward mail in outlook 365")
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.įor instructions on how to configure these settings, see Configure outbound spam filtering in EOP. On: Automatic external forwarding is allowed and not restricted. 
For more information, see this blog post. Over time, thanks to the principles of secure by default, this setting was gradually changed to Off for all customers. When this setting was originally introduced, it was equivalent to On. Automatic - System-controlled: This is the default setting.You can use outbound spam filter policies to control automatic forwarding to external recipients. This update will be communicated via Message Center post. Users with automatic forwarding from on-premises email systems through Microsoft 365 will be subject to the same policy controls as cloud mailboxes in an upcoming update. The admin can choose whether to simply forward messages, or keep copies of forwarded messages in the mailbox.
Admins can configure mailbox forwarding (also known as SMTP forwarding) to automatically forward messages to external recipients. Users can configure Inbox rules to automatically forward messages to external senders (deliberately or as a result of a compromised account). The following types of automatic forwarding are available in Microsoft 365: Attackers might use this information to attack your organization or partners. Email forwarding can be useful, but can also pose a security risk due to the potential disclosure of information. Learn about who can sign up and trial terms here.Īs an admin, you might have company requirements to restrict or control automatically forwarded messages to external recipients (recipients outside of your organization). Did you know you can try the features in Microsoft 365 Defender for Office 365 Plan 2 for free? Use the 90-day Defender for Office 365 trial at the Microsoft 365 Defender portal trials hub.
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