Microsoft Outlook | Outlook Mobile: New unverified sender banner in reading pane
From Microsoft 365 Message Center Archive by Merill Fernando · Microsoft may not have sent this notice to your tenant.Rollout
- Roadmap
- 491471
Rollout dates are often only in the text. When Microsoft moves them, the change shows under "What changed".
Schedule dates changed in the text
Date phrases in schedule sentences differ between the versions this installation saw- Seen 23 Sep 2025
mid-September 2025→ late October 2025 - Seen 19 Aug 2025
mid-August 2025→ mid-September 2025
Read from date phrases in Microsoft's text, not from notice metadata. A changed phrase can be a moved rollout, a new milestone or just rewording; "What changed" below shows which.
What the notice says
Microsoft’s text, safely structuredUpdated September 23, 2025: We have updated the timeline. Thank you for your patience.
We’re introducing a new visual indicator in the reading pane of Outlook Mobile (iOS and Android) to help users identify messages from unverified senders. This feature aligns with existing functionality in Outlook for desktop and web, bringing a consistent experience across platforms. When a message is from a sender we couldn’t verify as safe, users will see a banner in the reading pane warning them to be cautious.
This message is associated with Microsoft 365 Roadmap ID 491471.
When this will happen
General Availability (Worldwide): We will begin rolling out mid-July 2025 and expect to complete by late October 2025 (previously mid-September).
How this will affect your organization
When users receive an email from an unverified sender, they will see a banner in the reading pane explaining why the sender is flagged and warning about potential impersonation. This complements existing safety messages such as:
- “External sender”
- “Not on safe senders list”
- “You don’t often get email from this sender”
This feature is available by default when the unverified signal is received by the service. There are no admin controls to configure or disable this functionality.
What you need to do to prepare
No admin action is required. However, we recommend informing your users about this new visual cue and its purpose. If your organization provides internal training or documentation on email safety, consider updating it to include this new banner.
Learn more: Phishing and suspicious behavior in Outlook
What changed
Between archive captures, newest firstOnly details this page does not show changed.
Updated
August 19,September 23, 2025: We have updated the timeline. Thank you for your patience.mid-Septemberlate October 2025 (previouslymid-August).mid-September). How this will affect your organization: When users receive an email from …- Tags
Feature update, User impact→ Updated message, Feature update, User impact
Updated August 19, 2025: We have updated the timeline. Thank you for your patience. We’re introducing a new visual indicator in the reading pane of Outlook … We will begin rolling out mid-July 2025 and expect to complete by
mid-August 2025.mid-September 2025 (previously mid-August). How this will affect your organization: When users receive an email from …- Tags
- · first version seen
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