Send & Receive Issues

How to Fix Exchange Message Trace Showing Email Redirected or Dropped

Kushani Nimanthika Oct 21, 2026 868 views

Question details

Users intermittently fail to receive messages, with Exchange message trace indicating that emails are being redirected or dropped by a transport rules agent.

How to Fix Exchange Message Trace Showing Email Redirected or Dropped

Product: Microsoft Exchange
Device & OS: not provided
Scenario: Investigating intermittent email delivery failures to a helpdesk using the Exchange Message Trace tool.
Observed behavior: Message trace reports that incoming emails are intercepted, redirected, or dropped by a mail flow rule, DLP policy, or the transport rules agent, preventing delivery to the intended recipient.

Before you start

Ensure you have Exchange Administrator credentials and access to the Exchange Admin Center (EAC) or Exchange Online PowerShell to review and modify organizational mail flow rules.

Solution 1Recommended

Inspect Exchange Mail Flow Rules and Policies via Admin Center

Identify and review the transport rules, DLP policies, and recipient settings that may be intercepting and redirecting the emails.

When an email is redirected or dropped, it is typically caused by a specific mail flow rule (transport rule), a Data Loss Prevention (DLP) policy, or mailbox-level forwarding and moderation settings. Reviewing these configurations in the Exchange Admin Center helps identify the culprit.

Access the Exchange Admin Center

Review Mail Flow Rules

Navigate to 'Mail flow' and select 'Rules'. Look for any active rules that contain actions to 'Redirect the message to' or 'Delete the message without notifying anyone'. Check the conditions and priority of these rules.

Check DLP Policies

Go to 'Compliance management' and select 'Data loss prevention'. Review active policies to see if they are configured to block or redirect messages containing specific sensitive information types.

Verify Mailbox Moderation and Forwarding

Open the affected recipient's mailbox properties. Under 'Mailbox features', check if 'Message Delivery Restrictions' or 'Message Moderation' is enabled, which might be holding the email for approval. Also, verify that forwarding is not enabled without leaving a copy in the inbox.

Inspect Exchange Mail Flow Rules and Policies via Admin Center

Trace Details: The Message Trace details pane usually lists the specific name of the transport rule that triggered the action. Use this name to quickly locate the rule in the EAC.

Solution 2

Use Exchange Online PowerShell to Diagnose Transport Rules

Utilize PowerShell cmdlets to inspect the specific rule identified in the message trace and safely test email delivery.

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Frequently Asked Questions

What does 'redirected by transport rules agent' mean in a message trace?

This status indicates that an active mail flow rule (transport rule) in your Exchange environment intercepted the incoming email and changed its delivery destination based on predefined conditions set by an administrator.

Can mailbox forwarding cause emails to appear as dropped?

Yes. If a mailbox is configured to forward incoming emails to a different address and the 'Deliver message to both forwarding address and mailbox' option is unchecked, the email will not appear in the original recipient's inbox.

How do I find out exactly which transport rule blocked an email?

You can view this by running an Extended Message Trace in the Exchange Admin Center. When you click on the specific message trace event, the details pane will display the name or GUID of the rule that acted upon the message.

Is message moderation the same as a transport rule?

No, although they can both interrupt direct delivery. Message moderation is a mailbox feature that requires a designated reviewer to approve an email before it reaches the final recipient, whereas a transport rule applies actions automatically across the organization based on conditions.

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