Your plugin looks broken. I configured it and tested 5 emails. Out of 5, 3 were delivered, 2 got lost in way I guess. Your plugin also prevents user logins to wordpress by causing error 500. I had to deactivate / activate all plugins to see which plugin is causing troubles and I found its your plugin which causes prevents frontend user logins, even admin login at backend by showing error 500. You need to fix / update your plugin.
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