live:
1- If your site is hosted on godaddy you may use "relay-hosting.secureserver.net" without credentials.
2- If your site is hosted outside of godaddy you may use "smtpout.secureserver.net" with you email account credentials.
PS: Please change port 3535 if you have problems with 25
Hosted On GoDaddy
<system.net>
<mailSettings>
<smtp from="abc@xyz.net">
<network host="relay-hosting.secureserver.net"/>
</smtp>
</mailSettings>
</system.net>
External
<system.net>
<mailSettings>
<smtp from="abc@xyz.net">
<network host="smtpout.secureserver.net"
userName="abc@xyz.net" password="your_password_here"
port="25" />
</smtp>
</mailSettings>
</system.net>