STEPS TO RESOLVE FEEDBACK FORM ERROR IN ASP.NET SCRIPT:
If you get the below error message, follow the below steps to resolve Warning*: mail() [function.mail]: SMTP server response: 503 This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server.
The error message clearly states that SMTP authentication is required for sending mails from the script.
for this, you need to create a email-id & password and configure it on your script before sending the mails.
Please consult your programmer/designer to do this.
Note : Our support limited to server & controlpanel related issues and not to scripting of yours.