Yo tengo un sistema montado usando JMAIL, pero seria facilmente adaptable a CDONTS O ASPMAIL:
MAIL.ASP
Set JMail = Server.CreateObject ("JMail.SMTPMail")
' This is my local SMTP server
JMail.ServerAddress = "smtp.tudominio.com:25"
' This is me....
JMail.Sender = "[email protected]"
JMail.Subject = "Tu registro en Tusitio..."
' Get the recipients mailbox from a form (note the lack of a equal sign).
JMail.AddRecipient email
' The body property is both read and write.
' If you want to append text to the body you can
' use JMail.Body = JMail.Body & "Hello world! "
' or you can use JMail.AppendText "Hello World! "
' which in many cases is easier to use.
JMail.Body = "Gracias por registrarte, "& nombre &" Esperamos que disfrutes de tu estancia" & vbCrLf &_
"Tu Nombre de usuario es: " & nombre & " Tu Paswword es: " & password
' 1 - highest priority (Urgent)
' 3 - normal
' 5 - lowest
JMail.Priority = 1
JMail.AddHeader "Originating-IP", Request.ServerVariables ("REMOTE_ADDR")
' Send it...
JMail.Execute
Las variables se las puedes pasar mediante un fomulario normal y correien con el metodo POST.