Hello RNonay,
Thank you for your reply,
Since you have posted your issue in the New Outlook, we suppose that you were using New Outlook that is why we have shared the above picture from the New Outlook desktop. Reference: Getting started with the new Outlook for Windows - Microsoft Support
However, based on the picture you shared with us it seems like you are not using New Outlook but classic outlook for Windows.
I understand the critical importance of viewing email message source without triggering any potentially harmful content, especially in the context of security and phishing prevention.
Since the traditional methods for accessing message source in Outlook are not currently providing the desired functionality without opening the email, let's explore an alternative approach that may help you achieve your goal:
- **Using Message Header Analyzer Add-in:**
- Consider installing the Microsoft Message Header Analyzer add-in for Outlook. This add-in allows you to analyze the message headers without opening the email. After installing the add-in You can click on an email in Outlook and click on "Message Header Analyzer add-in " to access the header information.

-
- Regarding your "view message source" option on the right click menu - in outlook opening the message and properties is our traditional method for accessing message sources in classic Outlook and i have checked in our update feature in Microsoft 365 Roadmap we couldn't find any update about this feature in classic outlook. Microsoft 365 Roadmap | Microsoft 365.
You may check as well with your IT department if something has been done to view the source message in classic outlook as you described.
You may also consider providing feedback to Microsoft regarding the "View Message Source" option without opening the email. Microsoft values user feedback, and such input can influence future updates or changes in Outlook's features. please feel free to post this in our Feedback community by visiting Outlook · Community (microsoft.com) as it is a community monitored by our Product team to help improve user experience with Outlook, via feedback given by our valuable customers.
- Temporary Precautions
- As a temporary measure, you can disable external content in your Outlook settings to prevent automatic loading of images or embedded content in emails.
- Security Best Practices:
- In the meantime, ensure that your antivirus software is up to date, and exercise caution when handling suspicious emails by not clicking on unknown links or attachments.
While these solutions may help address the current limitation you are facing, I recommend continually monitoring for updates or enhancements in Outlook that may restore the functionality you require for safely viewing email message sources without exposing yourself to potential threats. If you have any additional concerns or specific requirements, feel free to share them, and I'll be glad to assist you further
We look forward to your reply. We will continue to assist you based on the information you provide. I sincerely appreciate your patience and cooperation.
SincerelyEben Ezer Tres | Microsoft Community Moderator