Based on the screenshot, your modified sendmail.php
file is ok. Please check your spam folder. It’s possible to send the email to your spam folder.
Moreover, it can be your hosting server issue. This is because, some hosting servers do not support PHPMailer (sendmail.php). In this issue, you need to contact with your hosting provider.
Please Note: PHPMailer is a 3rd party script. If your hosting server is not supporting this anyway, then there is nothing in our hands to support.
Best Regards,
ThemeLooks Support Team