Waiting List Free not sending Emails

Hello,

I am trying to use the Waiting List free version on website: https://potkupyorat.fi

I installed the plugin and made a test product with normal product properties. On this product the inventory is 0. Waiting list email address field and submit button appears in the product.

I fill in my email and go back to the product. I click “Send the Email to the users” button. The loading ball inside a ball of WooCommerce starts spinning, but nothing happens. The process doesn’t proceed nor I receive an email.

I am using the latest version of WooCommerce (2.3.13) and WordPress (4.2.2). I tried to deactivate other plugins, but it didn’t help either.

Other Emails of the web shop work perfectly

What could be the problem?

Best regards,

Johannes Kumpukoski
[email protected]

https://www.ads-software.com/plugins/yith-woocommerce-waiting-list/