The following error is returned when running CDONTS.NewMail on Windows 2003 (IIS 6)Invalid class string
' or
ActiveX component can't create object: 'CDONTS.NewMail'
' or
The "SendUsing" configuration value is invalid.

Cause

The problem is due to Microsoft's change in the name and progID when the DLL is used
to send mail through CDO. 

Resolution

Use the following Code: 
<%
    sch = "http://schemas.microsoft.com/cdo/configuration/"
    Set cdoConfig = Server.CreateObject("CDO.Configuration")
    cdoConfig.Fields.Item(sch & "sendusing") = 2
    cdoConfig.Fields.Item(sch & "smtpserver") =
"<enter_mail.server_here>"
    cdoConfig.Fields.update
 
    Set cdoMessage = Server.CreateObject("CDO.Message")
    Set cdoMessage.Configuration = cdoConfig
    cdoMessage.From = "from@me.com"
    cdoMessage.To = "to@me.com"
    cdoMessage.Subject = "Sample CDONTS NewMail"
    cdoMessage.TextBody = "This is a test for CDONTS message"
    cdoMessage.Send
    Set cdoMessage = Nothing
    Set cdoConfig = Nothing
%>

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