SMTP Connection refused

Hello,
This question has been asked several times before, but the answers people were giving don't seem to work for me. I am using Windows Server 2008 Enterprise, and IIS 7.
When trying to send an email, I constantly get the following error:
"No connection could be made because the target machine actively refused it 127.0.0.1:25"

I have the following in the web.config file:  <system.net>
<mailSettings>
<smtp from="">
<network defaultCredentials="false" password="" userName="" />
</smtp>
</mailSettings>
</system.net>  ...