>Dumb question, but I need to ask. Do the users have a UserID [e-mail account] on the Exchange server? If so, you can use wwIPStuff and populate the e-mail ID, account password and e-mail server properties [don't remember exact name of properties], then call the SendMail method.
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Yes...the users will have an email login/password. However, the email that is sent via our application will really come from a dummy email account(one that is a real account on the server, but not associated with a real person). I think that using this approach would be similar to what Brian has suggested too...change the Exchange server to force authentication and then pass along the username and password.

thanks...douglas