How to Read an Office 365 Encrypted Email Without the Read Message Button
Question details
The user needs to open an Office 365 encrypted email but the standard Read Message button is missing from the message interface.
- Product
- Microsoft Outlook / Office 365
- Device & OS
- not provided
- Scenario
- Attempting to access a secure, encrypted email received from an Office 365 user via Microsoft Purview Message Encryption.
- Observed behavior
- The Read Message button is not visible, preventing standard access to the encrypted email content, leaving the user unsure how to open it.
Ensure you have a stable internet connection and access to a modern web browser, as you may need to log into the Outlook web portal to view the encrypted message.
Use Outlook on the Web and the message.html Attachment
Access the encrypted email through the Outlook web client and use the built-in HTML attachment to trigger a one-time passcode verification.
Microsoft Purview Message Encryption sometimes hides the standard access button depending on your email client or the sender's security policy. Opening the message through the web interface often resolves this display issue.
Open your web browser and navigate to outlook.office.com. Log in with your email credentials.
Find and open the encrypted email in your inbox. Look for inline instructions or an attachment named 'message.html'.
Click on the 'message.html' attachment or select 'Read the message' if it appears. Choose the 'Use a one-time passcode' option, then check your inbox for the verification code sent by Microsoft to authenticate and view the content.
Request a Policy Adjustment from the Sender
If the message strictly requires the Outlook desktop client or prevents external access, the sender will need to modify their encryption settings.
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Frequently Asked Questions
Why is the Read Message button missing in my encrypted email?
This usually occurs due to compatibility issues with your email client, the recipient's email service, or strict Microsoft Purview encryption policies set by the sender's organization.
What is the message.html attachment in an encrypted email?
The message.html file is a secure portal attached to Office 365 encrypted emails. Opening it in a web browser allows you to verify your identity, usually via a one-time passcode, to safely view the message content.
Can I view Office 365 encrypted messages on a mobile device?
Yes. You can view them by using the official Outlook mobile app, or by tapping the message.html attachment in your mobile email app and requesting a one-time passcode through your mobile browser.
What should I do if the email says Outlook is required?
If you are prompted that the Outlook client is required and you cannot use a one-time passcode, the sender's encryption policy is restricting external access. You will need to contact the sender and ask them to adjust their permissions or use a different encryption method.
