Open the file php/contact-form.php (or contact-us-advanced.php if you are using the Advanced Contact Form) and enter your e-mail address and test the contact form on your server and test it:
Important:
For emails that are not in the same server as the website (www)) – Uncomment the settings and add the parameters for the SMTP authentication (Make sure you enter the correct settings, contact your email provider to get that information):
Debug:
You can enable the Debug to see the error message:
Use Chrome Dev Tools to Debug:
Alternative for Static Websites without PHP support: