Exporting the S/MIME Public Key from Firefox

If you have general questions about S/MIME encryption, you can find more information here.

If you would like to distribute your public key to your contacts so they can send you S/MIME encrypted emails, or if you want to use it in the mail.co.uk webmailer for inbound mailbox encryption and/or publish it in the mail.co.uk DNS via SMIMEA, you should save it as a separate file:

1. In Firefox, go to "Settings / Advanced / Certificates" and click "View Certificates".
2. Under "Your Certificates", you will see a certificate issued by "COMODO CA Limited ID".
3. Select it and click "View".
4. Click on "Details".
5. Click "Export" to save the public key as a file on your computer.
6. Enter a file name under "Save As".
7. Under "Location", choose where the file should be saved.

8. You have now saved the public key in PEM format. It looks like this:

-----BEGIN CERTIFICATE-----
xxxxxx
-----END CERTIFICATE-----

You can now share this public key with your contacts, have us publish it in the DNS system via SMIMEA, or use it with us for inbound mailbox encryption.