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S/MIME - How to Install Email ID Certificate in Outlook
發佈人 Sherry Li 發表於 26 November 2021 12:02 PM

S/MIME - How to Install Email ID Certificate in Outlook


1. Click on “File”, select "Options" on the down left corner of Outlook.

 Install S/MIME Certificate in Outlook



2. Access the Trust Center Settings

Select Options > Trust Center > Trust Center Settings.

 Install S/MIME Certificate in Outlook



3. Click on “Email Security",under the Digital IDs (Certificates) tab, click on “Import/Export”.

 Install S/MIME Certificate in Outlook



4. On the “Import/Export Digital ID” window, select the “Import existing Digital ID from a file” option and click on “Browser”.

 Install S/MIME Certificate in Outlook



5. Import File, select the file that is saved on your computer, it should be a .pfx file.

 Install S/MIME Certificate in Outlook



6. Enter the PKCS#12 password that you used when downloading the file and then click “OK”.

 Install S/MIME Certificate in Outlook



7. “Importing a new private change key” dialogue box that pops up, click “OK”.

 Install S/MIME Certificate in Outlook



8. In the “Email Security” tab, select “Settings”.

 Install S/MIME Certificate in Outlook



9. Enter the name for your security settings in the “Change Security Settings” window.

 Install S/MIME Certificate in Outlook



10. At “Signing Certificate”, under “Certificates and Algorithms”, click on “Choose” to load your certificate.

 Install S/MIME Certificate in Outlook



11.Confirm your certificate

If you have only installed one certificate (as in this example), you can click "OK" in the pop-up window. Otherwise, you must select one from the list of installed certificates.

 Install S/MIME Certificate in Outlook



12. Set Hash Algorithm is SHA256

 Install S/MIME Certificate in Outlook



13. Click on “Choose”, next to “Encryption Certificate”, if you have more than one certificate, select the same certificate as you did for the previous step 11.

 Install S/MIME Certificate in Outlook



14. Click “OK” to close the “Change Security Settings” window.

 Install S/MIME Certificate in Outlook



15.Under the “Encrypted email” tab, select the default options you want via the four checkboxes, then click “OK” to close the “Trust Center” window.

 Install S/MIME Certificate in Outlook



16. Set S/MIME options in the email.

Your certificate is installed and ready to be used! Firstly create a new email in Outlook. Under "Options", you can switch between email encryption and digital signature settings.

 Install S/MIME Certificate in Outlook



17. Allow Outlook to use your private key.

After sending an email, “Window Security” in the pop-up window, click “OK” to confirm.

 Install S/MIME Certificate in Outlook



18. Encryption problem

Please note that if you try to send an encrypted email but do not have the recipient’s public key, an encryption problem window will pop-up, and there is also an option to send unencrypted emails.

You can solve this encryption problem by asking the recipient to send you an encrypted email, and then adding them as contacts in Outlook.

 Install S/MIME Certificate in Outlook



19. Email Encryption

 Install S/MIME Certificate in Outlook



 Install S/MIME Certificate in Outlook



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