To sign an email with a certificate, you should:
Configure the certificate with Outlook
- Click on File and select Options
- In the Outlook Options window, select the Trust Center option on the left, and then press the Trust Center Settings button
- In the Trust Center window, select the Email Security option. In the Encrypted Email section, press the Settings button
- In the Change Security Settings window, fill in the fields:
- Security settings name - A name associated with your account (for example, your name). In the Signature certificate - Click the Choose button and select your certificate and use Hash Algorithm SHA256
- Check the checkbox Send these certificates with signed messages and click OK.
Send a Signed Email with Ms Outlook
- Click on new email
- Confirm in Options that the Sign button is pressed
- When sending the email, you will be prompted for the certificate PIN,
- Then the email will be sent signed.
You can verify that the email was sent signed by clicking on the red icon [Certificate] that appears on the right side of the email
In the details, you can validate all the signer's information.