Check this out, this guy had the same problem and the code at the end of the thread fixed it:
http://forums.aspfree.com/asp-development-5/cdo-message-1-error-80040220t-47913.htmlI've applied it to your code, try it out. You'll need to change the <enter_mail.server_here> to the IP/Name of your email server, if you're running a local instance you can probably just set that to 127.0.0.1.
I think that first part (the METADATA thing) needs to be at the to of your asp page. I don't do asp, so I'm not sure about that.