First things would be to ask if you installed SP3 for Exchange. If you did, then it closed relay so normal CDONTS won't work without authentication. This was a fix in SP3 to keep the open relay from being abused. Most servers were blacklisted after being randomly tested for open relay and ISP's around the world were using those blacklists to block servers that had this problem to help cut down on spam.
Here is the solution if this is your problem; (took me a couple weeks to find this and all my site's forms were run with CDONTS)
You need the following code to process your CDONTS email request. Just copy and paste this into a new asp page and it will process the fields stated below from the form the same way unauthenticated CDONTS does.
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