Email programs like Outlook and Outlook Express allow you to configure what Security Zone HTML-based emails should be opened in. In Outlook XP you can click on Tools --> Options and then select the Security tab. Under Secure Content select the Security Zone that you wish HTML emails to run in and then select OK to close the box.
Of course you can always resort to alternative products that may be more secure or lack some of the flaws inherent with their Microsoft counterparts. There are plenty of alternative email programs and popular web browsers like Netscape and Opera. Whatever you choose just make sure you familiarize yourself with the security features and configure it properly to protect yourself.
As always you should also ensure that you stay up to date on security issues with your applications- like Internet Explorer or Outlook Express- and apply any necessary patches or security updates to protect yourself from known vulnerabilities.
That does it for Lesson 9. We covered the use of antivirus software and personal firewall software as well as exposing hidden file extensions and controlling how and when active scripts are allowed to run on your system. One lesson to go and your Computer Security 101 education will be complete!