Why am I not receiving emails from my contact form?

This issue has nothing to do with the theme, it is most likely a server or plugin issue.

Make sure whatever contact form plugin (e.g. Contact Form 7) you're using is set up correctly and there are no typos the email address the messages are being sent to.

If your server does not allow emails to be sent out try using the following plugin: https://en-gb.wordpress.org/plugins/wp-mail-smtp/