Dear All This is my continuation of postfix setup. Following link http://campworld.net/thewiki/pmwiki.php/LinuxServersCentOS/Cent6VirtMailServerfor postfix setup. At one stage it says, Configuring The Server Setup SSL Certificate Now generate an SSL certificate for postfix and dovecot to have TLS support. Replace mail.example.com with your server hostname. > genkey --days 3650 mail.example.com My doubt is , 1. I have to install a SSL certificate for for web server (apache case). I am planning to purchase a SSL certificate and put it. The same certificate will be useful for both web server and mail server OR both web and mail server needs to separate separate SSL certificates. 2. I hope for web server case, one must purchase a ssl certificate and use it (so that browsers will work smoothly without complain). For mail server can one use locally generated ssl certificate? Kindly let me know. Best Regards Austin