I don't know how Front Page handled that, but when you code something like this in ASP and don't want to use the client's mail program, you'll need to send mail using a server side component. That is, a user fills in a form and submits it to a server side page. At the server, the text is retrieved from the form, an email message is constructed and then the message is sent using either a Windows built-in component or a commercial (or free) third-party component that you or your ISP has bought.
Take a look here:
http://Imar.Spaanjaars.Com/QuickDocId.aspx?QUICKDOC=249
There are many more articles available on the internet that describe how to send e-mail from an ASP page, so I guess you'll need to Google a bit as well.
Cheers,
Imar
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Imar Spaanjaars
Everyone is unique, except for me.