Subject and body are blank when sending S/MIME emails in Outlook for Mac

Support

Hello,

Select a different account.

You have multiple accounts

Choose the account you want to sign in with.

Applies To

Outlook for Microsoft 365 for Mac

Last Updated: June 2, 2025

ISSUE

When you manually encrypt an email with S/MIME and send it, you find that the subject and body are blank.

STATUS: INVESTIGATING

This issue has been escalated to the Outlook Team for investigation. We will update this topic when we know this will be fixed.

WORKAROUND

To work around the issue, enable the setting Always encrypt outgoing messages.

Additional Information

Send a digitally signed or encrypted message for Mac

More Resources

Ask the experts

Connect with experts, discuss the latest Outlook news and best practices, and read our blog.

Get help in the community

Ask a question and find solutions from Support Agents, MVPs, Engineers, and Outlook users.

Suggest a new feature

We love reading your suggestions and feedback! Share your thoughts. We're listening.