Github user trixpan commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/827#discussion_r74363178
  
    --- Diff: 
nifi-nar-bundles/nifi-email-bundle/nifi-email-processors/src/main/java/org/apache/nifi/processors/email/ListenSMTP.java
 ---
    @@ -106,26 +69,17 @@
                 .addValidator(StandardValidators.PORT_VALIDATOR)
                 .build();
     
    -    protected static final PropertyDescriptor SMTP_HOSTNAME = new 
PropertyDescriptor.Builder()
    -            .name("SMTP_HOSTNAME")
    --- End diff --
    
    @olegz yes it is just for display. It essentially was put in place to 
prevent servers from exposing names that the dataflow creator may prefer to 
omit. 
    
    There are other use cases tho:
    
    - Load balanced SMTP instances
    - Shared TLS certificates (where TLS validation is used from the sending 
MTA side)
    - "Please don't share my internal hostnames"
    
    and so on


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