I have tried both Contact Forms the one that you have with the Theme and Contact Form 7 and I am having no luck in figuring out why it is not sending messages to my email. Hope you are able to help me as I have been attempting to resolve this issue for a long while now.
Connection: opening to smtp.gmail.com:587, timeout=300, options=array ()
SMTP ERROR: Failed to connect to server: Network is unreachable (101)
SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
-Yuriy