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Thunderbird, how to use the free secure email certificate from Comodo for email digital signature and encryption

This is an alternative tutorial for https://www.b247.eu.org/2017/04/free-email-digital-signing-and-encryption.html where I have present a comprehensive way for emails digital signing and encryption.

As the aforementioned tutorial may be outdated or technikal skill required may be to much for everyday user and as this days the email security is a must, here I'll present a new, free way to acquire and use a digital certificate for your email.


The free certificate will be acquired from Comodo and used in Thunderbird email client.

Sign and encrypt your emails using Thunderbird and Comodo Certificates

Step 1: Sign up for a Comodo Free Email certificate

Access https://www.comodo.com/home/email-security/free-email-certificate.php and follow the instructions.  Important to known: use the Firefox Browser for that and keep it open after that. and, of course, use your real email address in the sign up form.
After a successfully application, instructions on how to collect the certificate will arrive on the email address provided.

Step 2: Open the email arrived from Comodo

In this email you will see a red button "Click & Install Comodo Email Certificate". Don't click on it, but instead right click this button and select "Copy Link Address".
Return to Firefox Browser, open a new tab (Ctr+T) and paste the copied address. A confirmation message should inform that the certificate have been installed.

Step 3: Save the certificate from Firefox to a known location

To do that, access Firefox->Preferences->Privacy & security ->View Certificates -> Your certificates
Select the fresh one just acquired and then Backup.

Step 4: Import the certificate in Thunderbird

Open Thunderbird, right click on your email account, settings->security->manage certificates.
Select Your certificates tab then Import the above backup-ed certificate.

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