Github user trixpan commented on the issue:
https://github.com/apache/nifi/pull/710
Getting errors when trying to use mailtrap.io for POP3 testing:
```
2016-07-25 10:37:27,706 ERROR [Timer-Driven Process Thread-6]
o.a.nifi.processors.email.ConsumePOP3
org.apache.nifi.processor.exception.ProcessException: Failed to receive
messages from Email server: [javax.mail.Mes
sagingException - error getting size
at
org.apache.nifi.processors.email.AbstractEmailProcessor.fillMessageQueueIfNecessary(AbstractEmailProcess
or.java:311) ~[na:na]
at
org.apache.nifi.processors.email.AbstractEmailProcessor.receiveMessage(AbstractEmailProcessor.java:373)
~[na:na]
at
org.apache.nifi.processors.email.AbstractEmailProcessor.onTrigger(AbstractEmailProcessor.java:182)
~[na:
na]
at
org.apache.nifi.processors.email.ConsumePOP3.onTrigger(ConsumePOP3.java:31)
~[na:na]
at
org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
~[nifi-api-1.0.0-SNAPSH
OT.jar:1.0.0-SNAPSHOT]
at
org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1077)
[nifi-framew
ork-core-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
at
org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:136)
[nifi-framework-core-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
at
org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:47)
[
nifi-framework-core-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
at
org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:1
23) [nifi-framework-core-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[na:1.8.0_91]
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
[na:1.8.0_91]
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecu
tor.java:180) [na:1.8.0_91]
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.jav
a:294) [na:1.8.0_91]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
[na:1.8.0_91]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
[na:1.8.0_91]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_91]
Caused by: javax.mail.MessagingException: error getting size
at com.sun.mail.pop3.POP3Message.getSize(POP3Message.java:145)
~[mail-1.4.7.jar:1.4.7]
at javax.mail.internet.MimeMessage.<init>(MimeMessage.java:238)
~[mail-1.4.7.jar:1.4.7]
at
org.springframework.integration.mail.AbstractMailReceiver$IntegrationMimeMessage.<init>(AbstractMailRece
iver.java:557) ~[na:na]
at
org.springframework.integration.mail.AbstractMailReceiver$IntegrationMimeMessage.<init>(AbstractMailRece
iver.java:552) ~[na:na]
at
org.springframework.integration.mail.AbstractMailReceiver.postProcessFilteredMessages(AbstractMailReceiv
er.java:415) ~[na:na]
at
org.springframework.integration.mail.AbstractMailReceiver.receive(AbstractMailReceiver.java:342)
~[na:na
]
at
org.apache.nifi.processors.email.AbstractEmailProcessor.fillMessageQueueIfNecessary(AbstractEmailProcess
or.java:306) ~[na:na]
... 15 common frames omitted
Caused by: java.io.IOException: Unexpected response: 1 95
at com.sun.mail.pop3.Protocol.readResponse(Protocol.java:752)
~[mail-1.4.7.jar:1.4.7]
at com.sun.mail.pop3.Protocol.simpleCommand(Protocol.java:692)
~[mail-1.4.7.jar:1.4.7]
at com.sun.mail.pop3.Protocol.list(Protocol.java:391)
~[mail-1.4.7.jar:1.4.7]
at com.sun.mail.pop3.POP3Message.getSize(POP3Message.java:138)
~[mail-1.4.7.jar:1.4.7]
... 21 common frames omitted
```
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