Last Updated: January 6, 2026
ISSUE
After updating to Current Channel Version 2511 (Build 19426.20218) recipients may not be able to open “Encrypt Only” emails.
In the Reading Pane you may get a message "This message with restricted permission cannot be viewed in the reading pane until you verify your credentials. Open the item to read its contents and verify your credentials."
After you open the email, you find an attachment message_v2.rpmsg and the recipient is not able to read the email.
STATUS: INVESTIGATING
The Outlook Team is investigating this issue for a fix. We will update this topic when we know more.
WORKAROUND
This issue happens if you encrypt the email using the settings under the email File dialog (File > Encrypt). To prevent the issue, select the Options ribbon, then select Encrypt, and choose Encrypt or Do Not Forward as noted in this article, Send encrypted messages with a Microsoft 365 personal or family subscription.
Alternately, you can revert to a build before the issue started and then send the email. The issue started with build 19426.20218. The next prior build that works is 19426.20186. To revert Office, do the following:
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Save your work and close all Office applications.
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Open an elevated Command Prompt.
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Run the following command: "%programfiles%\Common Files\Microsoft Shared\ClickToRun\officec2rclient.exe" /update user updatetoversion=16.0.19426.20186
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See Also
Fixes or workarounds for recent issues in classic Outlook for Windows
