New Outlook Trust Persistence Failure — Enterprise & Government Risk

Question

From: Network Engineer, Large Government Sector.

Summary

The New Outlook client introduces a regression in trust handling that materially disrupts enterprise and government operations. Specifically, the “Trust sender” action does not persist across messages from the same sender, forcing repeated user intervention for known, legitimate sources.

This behavior increases operational friction, creates security fatigue, and erodes confidence in the platform. It represents a departure from prior Outlook behavior without adequate documentation, configuration options, or administrative control.

Key Issues

• Trust actions do not persist across identical senders or domains.

Safe Senders and “Not Junk” actions are inconsistently honored.

Regression from classic Outlook with no feature parity or migration guidance.

Repeated prompts desensitize users, reducing real security effectiveness.

Automated alerts, ticketing systems, and partner communications are repeatedly flagged.

No tenant‑level or policy‑based override for trusted senders or domains.

Impact

Increased support burden on IT and security teams.

Productivity loss across large user populations.

Alert fatigue in regulated environments.

Growing dissatisfaction among enterprise and government customers.

Quiet evaluation of alternative platforms and reduced long‑term confidence.

Requested Actions

Clarify whether non‑persistent trust is intentional or a defect.

Restore persistent trust behavior or provide equivalent controls.

Introduce tenant‑level administrative policies for trusted senders/domains.

Acknowledge the regression and communicate a remediation path.

Closing

Security models must balance protection with usability. When informed user and administrator decisions are repeatedly disregarded, trust in the platform itself is undermined. In government and enterprise environments, this is a strategic concern requiring immediate attention. I have many more issues with MS and now I will start exclating all of them.

Answer 1

Hi @Tim,

Thank you for reaching out to Microsoft Q&A Forum.

You are encountering an issue in the New Outlook client, when a user chooses “Trust sender,” “Not Junk,” or adds a sender to Safe Senders, that decision does not reliably carry over to future emails from the same sender.

As a result, Outlook repeatedly treats emails from known, legitimate senders as untrusted or potentially unsafe even when the user has already indicated trust multiple times.

This suggests an underlying issue that requires deeper investigation through backend logging. Given the nature of the situation, the most effective next step is using their admin credentials to submit a support request through the Microsoft 365 Admin Center.

Microsoft also provides customer service phone numbers based on your region. You can find the appropriate contact number here: Customer service phone numbers - Microsoft Support 

This route ensures that a Microsoft support engineer can initiate a remote session to investigate backend configurations, run advanced diagnostic tools, and, if necessary, escalate the case to specialized teams with access to internal systems and logs. These backend resources are essential for resolving issues that go beyond what’s visible in the user interface.

As community moderators, we’re here to guide you, but due to privacy and security limitations, we don’t have access to the backend tools required for a full resolution. For this reason, contacting Microsoft Support via the Admin Center is the most secure and efficient way forward.

I hope this helps you resolve the issue quickly. I’m glad to assist and truly hope the information provided has been useful. Please feel free to reach out anytime if you need further assistance.  

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