You may want to define an Internet Explorer setting called Security Zone using a group policy.
This settings allows you to assign some specific URL’s to an Internet security zone; each security zone has specific settings such as automatic authentication, Active X control behavior…
So, to define this settings using GPO, you have to open your Group Policy management console, create a new GPO and edit it.
The GPO settings is Computer Configuration\Policies\Administrative Templates\Windows Components\Internet Explorer\Internet Control Panel\Security Page\Site to Zone Assignment List
When you edit this setting (Site to Zone Assignment List) you have to define the URL and the security zone (using a number from 1 (Intranet) to 4 (Restricted Sites) [2: Trusted Sites, 3: Internet].
BUT, if you are using Internet Explorer 7 or later with this setting configured, your end-users will not be able to add their own URL’s (such as their banking site).
So, if you want to configure site to zone assignment while allowing end-users to add their own URL’s, you must use another setting: Internet Explorer Maintenance.
This settings is User Configuration\Policies\Windows Settings\Internet Explorer Maintenance\Security\Security Zone and Content Ratings
Open the Security Zone and Content Ratings and choose Import the current security zones and privacy settings
By hitting the Modify Settings button you can assign the URL to the Security Zone you want to use as well as the security configuration (user authentication, Active X…).
This time, your Site to Zone configuration is deployed to your end users while you’re allowing them to add their own URL too.