I too faced the same issue of not receiving emails,although configuration was set as mentioned in the above article,then i added this property in botstrap-notification.xml and it worked for me. since my smtp didnt require any username and password authentication, i deleted those properties and added this one, <property name="SMTP Auth">false</property> (note this needs to be added additionally its not already there in default xml, need to false it as its default value is true (reference:https://github.com/apache/nifi/blob/master/nifi-bootstrap/src/main/java/org/apache/nifi/bootstrap/notification/email/EmailNotificationService.java) please vote up if my answer helped. ... View more