Compliance Problems

Fix Microsoft 365 Retention Policy Not Deleting Sent Items

Maira Mehtab Sep 22, 2026 868 views

Question details

The user needs to resolve an issue where a Microsoft 365 retention tag configured to delete items from the Sent Items folder after a specified timeframe is failing to remove the messages.

Product: Microsoft 365
Device & OS: not provided
Scenario: Managing mailbox lifecycle data by enforcing compliance retention tags for automated deletion of Sent Items.
Observed behavior: Emails in the Sent Items folder that have surpassed the specified retention period (e.g., 152 days) remain in the mailbox instead of being automatically deleted by the policy.

Before you start

Ensure you have Microsoft 365 Global Administrator or Exchange Administrator credentials to access the compliance center and review mailbox configuration settings.

Solution 1Recommended

Verify Tag Assignment and Allow Processing Time

Ensure the retention tag is correctly applied to the Sent Items folder and allow sufficient time for backend processing by the Managed Folder Assistant.

Microsoft 365 retention policies can experience propagation delays. Even after a policy is successfully applied to a mailbox, the Managed Folder Assistant (MFA) works on a 7-day work cycle by default, meaning automatic deletions may not reflect immediately.

Open Compliance Center

Log into the Microsoft Purview compliance portal and navigate to Data lifecycle management.

Verify Policy Assignment

Check the retention policies to ensure the specific retention tag targeting Sent Items is actively assigned to the affected user's mailbox.

Wait for Processing

Allow up to 7 days for the Managed Folder Assistant to cycle through the mailbox and execute the scheduled deletions, or force the assistant via Exchange Online PowerShell.

Solution 2

Contact Microsoft Support for Log Review

If the retention policy still fails to delete messages after the expected processing window, open a service request to investigate backend configurations.

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Frequently Asked Questions

How long does the Managed Folder Assistant take to process retention tags?

By default, the Managed Folder Assistant runs on a 7-day cycle. This means it can take up to a week for the assistant to fully process a mailbox and delete items that have expired under the assigned retention policy.

Can a user override a Sent Items retention policy?

Yes, if a user applies a personal retention tag with a longer retention period or a "Never Delete" tag to specific emails within the Sent Items folder, it may take precedence over the default folder-level policy.

Does placing a mailbox on litigation hold prevent retention policies from deleting sent items?

Yes. If a mailbox is under a litigation hold, eDiscovery hold, or an overriding retention lock, items will be preserved in the backend Recoverable Items folder even if the retention policy appears to attempt deletion from the Sent Items view.

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