General solution to handle web application errors?

Hello,


We have many web applications on our web server (Windows 2003 IIS 6.0).




We would like to have one solution to handle all web application errors:


- Redirect to general error website

- Send e-mail alert to server admin



We do not have access to source code of all our web applications (ASP.NET), so we cannot always handle errors in source code.




Do you know any good solution for this scenario?




One of our ideas was to set custom error section in web.config files, and redirect users to ASP.NET web application.


This application has to display user-friendly message and send email.



The problem is that such web page is potentially security hole!

Anyone can access such page and generate hundreds of email messages.




Maybe is it workaround for this?




Thanks!


Wojtek