Using Mailer On LocalHost

I have used Mailer successfully on websites before. This time, I am trying to run my Mailer code on localhost, with IIS. This line, which in general works, is now generating an error message:

set Mailer = Server.CreateObject("SMTPsvg.Mailer")

What I've tried so far:

set Mailer = Server.CreateObject("SMTPsvg.Mailer")
set Mailer = Server.CreateObject("CDONTS.NewMail")
set Mailer = Server.CreateObject("localhost")

I don't know if I should be trying something else, if I have to do something beyond the actual code, or if it is simply not possible to have mailer working on iis/localhost.