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MC1198702: Wait on Send for Data loss Prevention

By: Author Alex Lim

Posted on

Categories Update

Home » Update » MC1198702: Wait on Send for Data loss Prevention

Summary

  • New Outlook for Windows will enable a “Wait on Send” feature for DLP evaluation, enhancing data protection.
  • Admins need to enable this feature through Exchange mailbox settings; it is disabled by default.
  • Users can continue working while mail remains under evaluation, with override options based on specified timeout settings.
  • The feature aims to mitigate oversharing of sensitive content while maintaining user productivity.
  • The change is significant for both admins and users, offering improved compliance and user experience.

Admin Impact: Medium
User Impact: Low
Release Start: 01 Jan 2026
Release End: 31 Jan 2026
Services: Exchange, M365 Apps
Category: Stay informed
Tags: New Feature, User Adoption, Admin Action

History

12/17/2025 Item Added to Message Center

Microsoft Message

Introduction

New Outlook for Windows will support Wait on Send for Oversharing, allowing admins to block email sending if Data Loss Prevention (DLP) policy evaluation is not completed for labeled or sensitive content. The new experience allows for multi-tasking and does not block the user from using New Outlook even when mail is in evaluation.

The wait-on-send experience is controlled through Exchange mailbox parameters:

  • DLPWaitOnSendEnabled – Boolean (true or false), Default: false
  • DLPWaitOnSendTimeout – Integer (0–10000 seconds), Default: 9999

Specifies how long Outlook waits for the DLP evaluation to finish before offering an override.

Example: If the value is set to 25 seconds, Outlook will wait up to 25 seconds for the evaluation to complete before allowing the user to override and send the email without waiting for the evaluation to finish.

Note: This does not stop the evaluation after the set time. It simply allows the user to override while the evaluation continues. If the user prefers, they can wait until the evaluation is fully completed.

  • When DLPWaitOnSendTimeout = 0, user will immediately see “Send Anyway” in the info bar of mail.
  • When DLPWaitOnSendTimeout >= 9999, user will never be allowed to send the email without DLP evaluation getting completed.

This message is associated with Microsoft 365 Roadmap ID 498920.

When this will happen

  • General Availability (Worldwide): Early January 2026 – Late January 2026
  • General Availability (GCC): Early January 2026 – Early March 2026

How this affects your organization

Who is affected: Admins managing New Outlook for Windows users.

What will happen:

  • New Outlook will support Wait on Send for DLP evaluation.
  • Feature is disabled by default; admins must enable it via Exchange mailbox settings.
  • Users can continue working while mail is under evaluation.
  • Override behavior depends on DLPWaitOnSendTimeout configuration.

What you can do to prepare

  • No action required unless you want to enable this feature.
  • To enable, configure Exchange Online mailbox policy settings: Set-OrganizationConfig | ExchangePowerShell | Microsoft Learn

Learn more: Wait on Send dialog support for Oversharing for Outlook for Microsoft 365 | Microsoft Learn

Compliance considerations

No compliance considerations identified. Review as appropriate for your organization.