How to modify opencart url structure?

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

Just Enable SEO URLs in OpenCart SEO URLs are turned off by default. We have to enable them first.
1. Go to Admin Panel -> System -> Settings.
2. Click on “Edit” link on the right side of the store name. Store Settings
3. Click on “Server” tab. You will find an option – “Use SEO URL’s”. Click on “Yes” in front of it. Save the options.