Finally got to implement Lets Encrypt on my personal server. It feels good to transition from StartSSL to the free Lets Encrypt. I was able to use this on my Apache, Postfix and Dovecot installs.
I also setup a crontab entry to renew the cert every two months.
I was annoyed coz my N95 keeps giving me untrusted certificate popups everytime I access my email on my dovecot/postfix server. Fortunately ,I was able to find a solution. Apperently ,S60 phones does not like the regular pem format certificate it need the DER ones.
All credit goes to this post!