Disable JavaScript Support
Disabling JavaScript is important for protecting yourself against e-mail spying. There is absolutely no reason why e-mail client should run JavaScript embedded in e-mail messages.
Microsoft allows you to turn off JavaScript in its e-mail programs; unfortunately, doing so will also disable JavaScript in Internet Explorer as well, where many Web pages rely on JavaScript to work.
Microsoft Outlook
Choose "Tools", and then "Options", and then select the "Security" tab. In the "Secure Content" area, choose the dropdown menu for "Zone" and select "Restricted Sites.

Choose the Restricted Sites zone in Outlook
Now click the "Zone Settings ..." button. A warning box will open informing you that you are about to change settings that will affect Outlook, Outlook Express, and Internet Explorer. Since you already know that and ready, click "OK". In the "Security" window that will open next, choose "Restricted Sites" as it is shown on the picture shows.

Choose Restricted Sites on the Security tab of Internet Options control panel
Microsoft Outlook Express
Select "Tools", and then "Options", and then select the "Security" tab. In the Security Zones section, select "Restricted Sites Zone (More secure)".

Turn off JavaScript in Outlook Express
Open the "Control Panel" and choose "Internet Options". Click on the "Security" tab and choose "Restricted Sites", as it is shown on the picture.

Choose Restricted Sites on the Security tab of Internet Options control panel
Mozilla or Netscape E-mail Program
Mozilla and Netscape 6 allow you to enable JavaScript for Web browsing but disable it while reading e-mail. These preferences reflect the needs of many people.
In either the Web browser or the e-mail program, choose the Edit menu, then "Preferences", then "Advanced", and then "Scripts & Windows". At the top of the preferences page, you can set JavaScript as you it fits you best.

Disable JavaScript for Mozilla/Netscape e-mail while leaving it on for Web browsing