Hi StevenS,
Please set property "UploadUrl", you can write email send code in the handler file.
<%
Dim uploader
Set uploader=new AspUploader
uploader.UploadUrl="myhandler.asp"
uploader.Render()
%>
In the download package, you can find the following 3 files, these are the examples of customization handler. You can refer to them.
ajax-multiplefiles-handler.asp
ajax-attachments-handler.asp
misc-filemanager-handler.asp