- Outlook patch (Build 19426.20218) broke “Encrypt only” emails, showing unreadable attachments
- Workarounds: Use encryption from the Options ribbon or revert to version 19426.20186 via Command Prompt.
- Microsoft has also disabled inline SVGs in Outlook for Web and the new Outlook for Windows.
Microsoft released a new patch for classic Outlook and broke how encrypted emails work. It is currently working on a fix and, in the meantime, offers several ways to open encrypted emails in the popular client application.
In a short update released on January 6, Microsoft said that after updating to Current Channel version 2511 (Build 19426.20218), email recipients may not be able to open “Encrypt Only” messages.
The error appears in the Reading Pane, where users may receive a message stating “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.”
Two workarounds
After opening the email, users will find a message_v2.rpmsg attachment and will not be able to read the contents.
The issue occurs for users who encrypt email using settings in the Email File dialog box (File > Encrypt), Microsoft explained. To avoid this problem, there are two possible solutions. For the first, users need to select the Options ribbon, then select Encrypt and choose Encrypt or Do Not Transfer.
The second solution is to revert to a version before the problem and then send the email. The issue started with build 19426.20218, and the next older version that works is 19426.20186. To restore Office, users must open an elevated command prompt and run this command:
“%programfiles%Common FilesMicrosoft SharedClickToRunofficec2rclient.exe” /update user updatetoversion=16.0.19426.20186
Email is by far the most attacked vector and the preferred communications platform in the event of an initial compromise. Microsoft often patches Outlook to fill various holes and only recently changed the way Outlook handles SVG images.
In an update to Microsoft 365 Message Center, the tech giant said: “Inline SVG images will no longer be displayed in Outlook for the web or the new Outlook for Windows. Instead, users will see empty spaces where these images should have appeared. »
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