Contact Form Issue

It sounds like your hosting provider has disabled PHP’s mail() function, which Jetpack, like other contact form plugins, uses. It’s the same function that is used by WordPress to send you comment notifications, or notifications about new users registering on your site.

This is a common safeguard employed by hosting providers when they suspect that another customer on the same server is sending spam emails directly from the server.

Another alternative is that PHP’s mail() function is still active, but spammer activity from the server has already caused any email sent from it to be blacklisted. This would result in the emails being sent, but never received by any email address with basic anti-spam capabilities.

You can check this by leaving a comment on your site and checking if you receive an email. Another alternative would be to use the Check Email plugin and sending yourself a test email to see if it works? You can download the plugin here:
https://www.ads-software.com/plugins/check-email/

If you didn’t receive a test email, you could try using a plugin like this one to configure your WordPress site to use your email’s outgoing mail server instead of PHP’s mail() function:
https://www.ads-software.com/plugins/postman-smtp/

Thank you. I plan to look into this when I get a chance.

Let us know how you go ??