Hi,
Please check if the messages are marked as “paid” or “not paid” in the messages page.
If the messages are marked as paid then the problem is that your WordPress isn’t delivering the emails. You should setup the WordPress to deliver the emails according to your mail server settings. You may have to ask to your web hosting support about the requirements to send emails from WordPress/PHP with their hosting service.
On the other hand if the messages aren’t marked as “paid” then the PayPal IPN connection isn’t being received, in this case check if the payment appears marked as “completed” in the “seller PayPal account” . Note also that you should test this feature into an online website (local websites cannot receive PayPal IPN connections).
In all cases please check the “from” email address used in the settings. Note that if you use a “from” email from a public email service like “@hotmail.com”, “@aol.com”, “@outlook.com”, “@gmail.com”, … it will be filtered by most antispam systems since the email will be identified as “not originated at the expected server”, so try using a “from” address that belongs to the website domain.
Thank you for using the plugin!