Set up email digital signatures in Outlook

By Threat Simplified Team9/15/2025

Imagine sending a letter in the mail but adding a special seal to show it’s really from you. Setting up a digital signature in Outlook is like that seal for your emails—it proves your identity.

Set up email digital signatures in Outlook

Set up email digital signatures in Outlook

It also ensures the message hasn’t been tampered with. Let’s walk through how to set one up so your emails look more official and secure!

Prerequisites

Before you start, make sure you have the following:

  • A computer with Microsoft Outlook installed.
  • An email account set up in Outlook.
  • A digital certificate (sometimes called a digital ID), which you can usually get from a trusted provider.

Estimated Time to Complete

This task should take about 10-15 minutes.

Steps

  1. Open Microsoft Outlook. Launch the application on your computer.

    Screenshot showing Outlook desktop application

  2. Go to the File menu. Click on "File" in the top-left corner of the screen.

    Screenshot showing File menu

  3. Select Options. In the menu that appears, click on "Options."

    Screenshot showing Options selection

  4. Click on Trust Center. In the Outlook Options window, find and click on "Trust Center" in the left sidebar.

    Screenshot showing Trust Center

  5. Open Trust Center Settings. Now click on the "Trust Center Settings..." button on the right.

    Screenshot showing Trust Center Settings button

  6. Choose Email Security. In the Trust Center window, select "Email Security" from the list on the left.

    Screenshot showing Email Security selection

  7. Set up your digital ID. Under “Digital IDs (sCertificates),” click on “Get a Digital ID” or “Import/Export” to add your certificate if you already have one.

    Screenshot showing Digital ID section

  8. Create a new digital signature. In the same Email Security window, check the box next to “Add digital signature to outgoing messages.”

    Screenshot showing the digital signature option

  9. Click OK to save your settings. Keep clicking OK to exit out of the Trust Center and Options settings.

    Screenshot showing OK button

  10. Test your digital signature. Compose a new email and send it to yourself. Make sure to check for the signature at the bottom of your email!

    Screenshot showing new email composition

Troubleshooting Tips

  • Not seeing the digital signature in emails? Double-check that you’ve enabled it in the Email Security settings and ensure your digital certificate is properly installed.
  • Certificate issues? If you encounter any problems with your digital certificate, try contacting the provider where you obtained it for additional support.

If you’re unsure, it’s okay to stop and ask for help before trying again.

Expected Outcome

When you finish these steps, your emails will include your digital signature, letting recipients know that the message is authentic and has not been changed.

Bonus Tip: When creating accounts or setting up passwords, remember to use at least 12 characters with a mix of letters, numbers, and symbols. Avoid using names or birthdays for additional security.

Happy emailing!

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