trigger email after products reviews

Hi,
I’m writing you regarding an issue about the email that should be sent whenever a review is posted (or a user is registered).
It doesn’t work anymore.
Whenever a review is posted, the system doesn’t send the request so the email isn’t sent (so I don’t even have a significant log file).
We have tried using a plugin, WP-Mail-SMTP, to overwrite the problems that could have been, but it still desn’t work.
Strange thing is: when we approve the message in the backend, the email is triggered!
But is useless to have an email since you are the eprsone who have confirmed it.

What can we do or check?

Thank you

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