SMTP settings in web.config

Hi,

I want to send email from my sandbox account but I got an error, here is my my mailSettings section in web.config:

<system.net>
<mailSettings>
<smtp deliveryMethod="Network" from="[email protected]">
<network defaultCredentials="true" host="localhost" port="25" />
</smtp>
</mailSettings>
</system.net>

the error:

No connection could be made because the target machine actively refused it 127.0.0.1:25

What are the settings for sending email from DASP's smtp server?