How to Configure S/MIME in Office 365

May 16, 2023

How to Configure S/MIME in Office 365


This support article will guide you through the step-by-step process of configuring S/MIME in Office 365.  
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  1. You need to download and install your Certificate on your computer before you can proceed with this. 


  1. Open Microsoft Office 365

  2. Then, open Microsoft Outlook

    Note: If Outlook application is not installed, it will open on your default browser.
  3. Go to Settings, then, click View all Outlook settings

  4. Go to Mail – S/MIME. Make sure to mark all boxes in order to use the Certificate. 

  5. Send an Email.
    Note: By default all outgoing emails have a Certificate.

  6. To check, press “click here” to see certificate properties that was used. 


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