This support article will guide you through the step-by-step process of configuring S/MIME in Office 365.
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You need to download and install your Certificate on your computer before you can proceed with this.
Open Microsoft Office 365.
Then, open Microsoft Outlook.
Note: If Outlook application is not installed, it will open on your default browser.
Go to Settings, then, click View all Outlook settings.
Go to Mail – S/MIME. Make sure to mark all boxes in order to use the Certificate.
Send an Email. Note: By default all outgoing emails have a Certificate.
To check, press “click here” to see certificate properties that was used.