Verification emails are not being sent

Thanks for making available this great plugin! One issue I encounter is there are apparently no verification emails being sent.

As shown below I have chosen to request verification emails and saved these settings. I did not change the standard supplied text in the verification template. When I then test this by entering a review and entering my own email address, I do not receive an email, while I do get the confirmation message that the review has been submitted. I have tested with several posts and email addresses, switching the option to request verification on/off, all without success.