Problem Description...
Upon creating a web-based e-mail form, the web user encounters the following message when trying to submit the form:

Cannot run the FrontPage Server Extensions' Smart HTML interpreter on this non-HTML page: "http://servername/subweb/default.asp"

Problem Detail...
Microsoft had a security problem with this functionality and decided to disable support for it. Furthur information can be found on Microsoft's website at:
http://support.microsoft.com/default.aspx?scid=kb;EN-US;q230712&GSSNB=1

Problem Resolution...
To fix this problem, we recommend using the Indigo Form Mail product that is included with your Digital Indigo hosting account. This product allows you to create forms on your website and post them to an e-mail. It has many enhanced features and security measures to help prevent abuse of your website.

For Indigo Form Mail information, please click here.