(Posted to General Q&A yesterday, but no response. http://www.aspmessageboard.com/forum/asp.asp?M=258959&P=1&F=20)<BR><BR>I get an "Invalid class string" error on this line: <BR><BR> Set objMail = Server.CreateObject("CDONTS.NewMail") <BR><BR>This message would normally mean that I don&#039;t have the SMTP service installed. Oddly enough, it is. I checked the Services control panel, and the SMTP service is happily running. <BR><BR>Any idea why I can&#039;t access the component, then? <BR><BR>I am running Windows XP RC1, everything freshly installed yesterday.<BR><BR>Thanks,<BR>Mark P.