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Finally, we have managed to install our existing S/MIME certificate to our new Exchange Online office 365.
We googled and found hundreds of procedures on how to configure S/MIME encryption certificates however 95% of editors just copy and paste from Microsoft blogs which can be annoying as they do not provide any good explanation.
It is fairly easy if you check the requirements before you start: Read more
First look for a certificate provider who can provide a free SSL/TLS for Server certificate. I have searched and compiled a list of free certificates who can provide a free certificate for QNAP.
I will show you how to get the certificate and install these on the QNAP from startssl.com, with this you can get unlimited free renewals.
Please check the list below:
List of free SSL/TLS certificates:
- https://startssl.com/
- https://buy.wosign.com/free ( some time you get untrusted seller ).
- https://letsencrypt.org/ ( Auto install with Plesk ).
- https://www.digitalberg.com/ssl-certificates/ssl-price/ (from top provider).