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

    https://github.com/apache/nifi/pull/827#discussion_r74362552
  
    --- Diff: 
nifi-nar-bundles/nifi-email-bundle/nifi-email-processors/src/main/java/org/apache/nifi/processors/email/ListenSMTP.java
 ---
    @@ -13,89 +13,52 @@
      *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 
implied.
      *  See the License for the specific language governing permissions and
      *  limitations under the License.
    -*/
    + */
     package org.apache.nifi.processors.email;
     
    -import javax.net.ssl.SSLContext;
    -import javax.net.ssl.SSLSocket;
    -import javax.net.ssl.SSLSocketFactory;
     import java.io.IOException;
    -import java.io.InputStream;
    +import java.io.OutputStream;
     import java.net.InetSocketAddress;
     import java.net.Socket;
     import java.util.ArrayList;
    -import java.util.Collection;
     import java.util.Collections;
    -import java.util.HashMap;
     import java.util.HashSet;
     import java.util.List;
    -import java.util.Map;
     import java.util.Set;
    -import java.util.concurrent.LinkedBlockingQueue;
     import java.util.concurrent.TimeUnit;
    -import java.util.concurrent.atomic.AtomicBoolean;
    -
    -import org.apache.commons.lang3.StringUtils;
    -
    -import org.subethamail.smtp.server.SMTPServer;
    -
    -
    -import org.apache.nifi.annotation.lifecycle.OnStopped;
    -import org.apache.nifi.annotation.lifecycle.OnUnscheduled;
    -import org.apache.nifi.flowfile.attributes.CoreAttributes;
    -import org.apache.nifi.processor.DataUnit;
    +import java.util.concurrent.atomic.AtomicInteger;
     
    -import org.apache.nifi.annotation.lifecycle.OnScheduled;
    -import org.apache.nifi.components.PropertyDescriptor;
    -import org.apache.nifi.processor.AbstractProcessor;
    -import org.apache.nifi.processor.ProcessorInitializationContext;
    -import org.apache.nifi.processor.Relationship;
    -import org.apache.nifi.processor.util.StandardValidators;
    +import javax.net.ssl.SSLContext;
    +import javax.net.ssl.SSLSocket;
    +import javax.net.ssl.SSLSocketFactory;
     
    +import org.apache.commons.io.IOUtils;
     import org.apache.nifi.annotation.behavior.InputRequirement;
    -import org.apache.nifi.annotation.behavior.WritesAttribute;
    -import org.apache.nifi.annotation.behavior.WritesAttributes;
     import org.apache.nifi.annotation.documentation.CapabilityDescription;
     import org.apache.nifi.annotation.documentation.Tags;
    +import org.apache.nifi.annotation.lifecycle.OnStopped;
    +import org.apache.nifi.components.PropertyDescriptor;
    +import org.apache.nifi.flowfile.FlowFile;
    +import org.apache.nifi.processor.AbstractSessionFactoryProcessor;
    +import org.apache.nifi.processor.DataUnit;
     import org.apache.nifi.processor.ProcessContext;
     import org.apache.nifi.processor.ProcessSession;
    +import org.apache.nifi.processor.ProcessSessionFactory;
    +import org.apache.nifi.processor.Relationship;
     import org.apache.nifi.processor.exception.ProcessException;
    -import org.apache.nifi.components.ValidationContext;
    -import org.apache.nifi.components.ValidationResult;
    -import org.apache.nifi.flowfile.FlowFile;
    +import org.apache.nifi.processor.io.OutputStreamCallback;
    +import org.apache.nifi.processor.util.StandardValidators;
     import org.apache.nifi.ssl.SSLContextService;
    -
    -import org.apache.nifi.processors.email.smtp.event.SmtpEvent;
    -import org.apache.nifi.processors.email.smtp.handler.SMTPResultCode;
    -import 
org.apache.nifi.processors.email.smtp.handler.SMTPMessageHandlerFactory;
    +import org.subethamail.smtp.server.SMTPServer;
     
     @Tags({"listen", "email", "smtp"})
     @InputRequirement(InputRequirement.Requirement.INPUT_FORBIDDEN)
    -@CapabilityDescription("This processor implements a lightweight SMTP 
server to an arbitrary port, " +
    -        "allowing nifi to listen for incoming email. " +
    -        "" +
    -        "Note this server does not perform any email validation. If direct 
exposure to the internet is sought," +
    -        "it may be a better idea to use the combination of NiFi and an 
industrial scale MTA (e.g. Postfix)")
    -@WritesAttributes({
    -        @WritesAttribute(attribute = "mime.type", description = "The value 
used during HELO"),
    -        @WritesAttribute(attribute = "smtp.helo", description = "The value 
used during HELO"),
    -        @WritesAttribute(attribute = "smtp.certificates.*.serial", 
description = "The serial numbers for each of the " +
    -                "certificates used by an TLS peer"),
    -        @WritesAttribute(attribute = "smtp.certificates.*.principal", 
description = "The principal for each of the " +
    -                "certificates used by an TLS peer"),
    -        @WritesAttribute(attribute = "smtp.from", description = "The value 
used during MAIL FROM (i.e. envelope)"),
    -        @WritesAttribute(attribute = "smtp.to", description = "The value 
used during RCPT TO (i.e. envelope)"),
    -        @WritesAttribute(attribute = "smtp.src", description = "The source 
IP of the SMTP connection")})
    --- End diff --
    
    As I just mentioned in the previous moment, adding things in the future is 
possible, removing is not. So I'd like to know (outside of "just in case") 
practical implication of those attributes to justify having them now. Also, the 
to/from/and few others can be derived from message.  


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