Use digital signatures for email on Windows 10 Mobile phones

The instructions below apply only to Windows 10 Mobile phones. Windows Phone 8.1 is not supported.

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Before you begin

You can use S/MIME certificates, also called "S/MIME Certs" or "Personal Certificates", with most email clients to digitally sign and/or encrypt email messages. At Indiana University, S/MIME certificates are provided by the InCommon Certificate Service. For instructions on getting a certificate, see Get an S/MIME certificate for digital email signatures at IU.

When you receive your certificate from InCommon, it will be encrypted in the PKCS 12 format (.p12 or .pfx), using the strong passphrase ("PIN") you created for it at the time of request. You will need this passphrase to install the certificate.

Also, for details about potential issues with various devices and applications when using digital signatures, be sure to refer to Known issues with digitally signed email at IU.

You should already have your certificate file from InCommon on your personal computer. If you are unable to find your certificate file, you can export it from the certificate management application for your computer. For export instructions, see Use digital signatures for email with Apple Mail and Outlook for macOS or Use digital signatures for email with Microsoft Outlook for Windows.

Install your certificate

  1. From your computer, send yourself an email message with your certificate as an attachment.
  2. On your Windows 10 Mobile phone, open the email message and tap the Signed message link, and then tap the certificate attachment.
  3. Enter the password for the certificate file, and tap Done.
  4. To install the certificate, tap Install.
  5. Tap OK.

Send a digitally signed message

  1. On your Windows 10 Mobile phone, open Exchange.
  2. Create a message, entering addressee(s), subject, and message content.
  3. At the lower right, tap ... (the option button), and select add digital signature. The certificate icon and "Signed message" will appear just below the email message's subject line and above the message content.
  4. Tap Send.

Use a group account certificate

To use an S/MIME certificate with a group account, install and enable the certificate as you would for a standard account.

  • If the profile you are using in your email client is the group account, there should be no issues.
  • If the profile you are using in your email client is your personal account and you want to send email from the group account, in your email message, open the "From" field and enter the group account address. If your personal account has "send as" rights for the group account, there should be no issues. If you are unsure whether you have "send as" rights, contact your IT Pro.

This is document akqz in the Knowledge Base.
Last modified on 2018-01-05 15:57:24.

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