Easy question related to my web site….

I have a web server (IIS 4.0) running multiple sites, each in it’s own memory space (to avoid bringing all sites down in the event one crashes).

My problem is a particular site I have calls
a .dll file in sending a mail message. WHen the site runs in it’s own memory space, it can’t call the .dll. When I take it out of it’s own memory space, it runs fine.

So, when I load a site in it’s own memory space how do I load the dll with it?