Note: Your app interface may differ depending on your Android version. The screenshots shown below were taken with an Android 9 device.

Before you install an email certificate

Make sure you request and download your S/MIME certificate first. Learn more about how to request and download a GlobalSign S/MIME certificate.

How to install an email certificate

Navigate to the folder where your downloaded certificate is stored and click on the certificate file.
Enter your certificate password and click 'OK'.
Rename your certificate if desired and click 'OK'. Your certificate has now been installed.
In your email app (e.g. Outlook), go to Settings > Security to enable S/MIME. Click the toggle to enable S/MIME. In the pop-up, click 'OK'.
To encrypt your messages, click on the ellipses in a new message/reply and select 'Sign and Encrypt'.