Send & Receive Issues

Fix Emails Forwarding Automatically Without an Outlook Rule

Maira Mehtab Sep 22, 2026 869 views

Question details

Users are experiencing automatic email forwarding in Outlook despite having no visible forwarding rules configured in Outlook, Outlook on the Web, Power Automate, or Exchange.

Product: Microsoft Outlook / Exchange
Device & OS: not provided
Scenario: Investigating hidden routing or administrative settings that cause emails to forward unexpectedly without standard user-level configurations.
Observed behavior: Emails are being forwarded automatically to other addresses, yet no local or server-side user forwarding rules are visible to explain the behavior.

Before you start

Before proceeding, check your account's recent sign-in activity to ensure it has not been compromised by an unauthorized third party.

Solution 1Recommended

Inspect Organization-Wide Transport Rules and Delegation

Identify hidden backend settings or organizational policies that may be routing your emails at the server level.

Often, emails are forwarded before they even reach the user's inbox due to rules set by an IT administrator in the Exchange admin center.

Access Exchange admin center

Have an administrator log into the Microsoft 365 admin center or Exchange admin center.

Check transport rules

Navigate to 'Mail flow' and select 'Rules' to check for any organization-wide transport rules that might be redirecting or forwarding messages intended for your address.

Verify mailbox delegation

Go to 'Recipients' > 'Mailboxes', select the affected mailbox, and check the 'Mailbox delegation' settings to see if another user has been granted permission to access or forward your emails.

Solution 2

Review Connected Applications and Device Settings

Ensure no external applications or synced mobile devices are bypassing Outlook rules to forward your mail locally.

Solution 3

Check Audit Logs and Request Mail-Flow Tracing

Use Microsoft 365 advanced diagnostics to trace the email path if standard checks do not reveal the cause.

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Frequently Asked Questions

Can a compromised account create hidden forwarding rules?

Yes, attackers often create hidden inbox rules using specialized tools like MFCMAPI to forward emails without the rules appearing in the standard Outlook interface. Reviewing audit logs and running a message trace can help identify this malicious activity.

Do Microsoft 365 transport rules override my personal Outlook rules?

Yes, organization-wide transport rules configured by your IT administrator are processed at the Exchange server level before any personal Outlook inbox rules are applied to your messages.

How do I check if my mailbox is shared or delegated?

You or your IT administrator can check this in the Exchange admin center under Recipients > Mailboxes. Selecting your mailbox and viewing the 'Mailbox delegation' tab will reveal who has 'Send as', 'Send on behalf', or 'Full access' permissions.

Outlook & Email Problems