Github user trixpan commented on the issue: https://github.com/apache/nifi/pull/827 @olegz thanks for the clarification. Just so that we are on the same page, I am not concerned about the DFM in this case. What I mean by notification is the following: SMTP allows you to convey messages back to the client (These messages are called reply codes). You can send a 5XX reply back and the server will not retry Or you can send a 4XX and the server will retry after a few minutes. Send nothing and reaction will depend on who is sending. Here's a list: http://www.greenend.org.uk/rjk/tech/smtpreplies.html This is why this was in here: https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-email-bundle/nifi-email-processors/src/main/java/org/apache/nifi/processors/email/smtp/handler/SMTPResultCode.java
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