How to Install SSL Certificate in OpenCart?

Question

I have installed Opencart 1.5.6.4 as a fresh install. Post installation everything works like a charm, but the users aren't receiving confirmation emails on account registration, forgot password or on orders. I have tried following work around from Opencart forum, yet to be successful. If I'm using customized php auto response mail application, I'm able to send the same but not working with Opencart.
Though it shows mail sent, but not received

Answer 1

Enable SSL in the OpenCart Directory config.php File
Open control panel and log into it, then go to File Manager.
Navigate to OpenCart installation directory.
Browse “Admin” folder.
Open the configuration file (config.php) and look for the below lines appeared as HTTPS:

For more Information : http://www.codeproject.com/Tips/611494/How-to-Install-SSL-Certificate-in-OpenCart