Github user trixpan commented on the issue:
https://github.com/apache/nifi/pull/827
@olegz is this expected?
```
2016-08-12 01:23:59,420 ERROR [Timer-Driven Process Thread-6]
o.a.nifi.processors.email.ListenSMTP
org.apache.nifi.processor.exception.ProcessException: IOException thrown
from ListenSMTP[id=771e0608-0156-1000-832a-7f44efc04123]:
java.net.SocketTimeoutException: Read timed out
at
org.apache.nifi.controller.repository.StandardProcessSession.write(StandardProcessSession.java:2138)
~[nifi-framework-core-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
at
org.apache.nifi.processors.email.ListenSMTP.lambda$onTrigger$0(ListenSMTP.java:202)
~[nifi-email-processors-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
at
org.apache.nifi.processors.email.SmtpConsumer.consumeUsing(SmtpConsumer.java:104)
~[nifi-email-processors-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
at
org.apache.nifi.processors.email.ListenSMTP.onTrigger(ListenSMTP.java:199)
~[nifi-email-processors-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
at
org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1060)
[nifi-framework-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$1.run(TimerDrivenSchedulingAgent.java:127)
[nifi-framework-core-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
at
java.util.concurrent.Executors$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$301(ScheduledThreadPoolExecutor.java:180)
[na:1.8.0_91]
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java: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: java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.socketRead0(Native Method)
~[na:1.8.0_91]
at
java.net.SocketInputStream.socketRead(SocketInputStream.java:116) ~[na:1.8.0_91]
at java.net.SocketInputStream.read(SocketInputStream.java:170)
~[na:1.8.0_91]
at java.net.SocketInputStream.read(SocketInputStream.java:141)
~[na:1.8.0_91]
at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
~[na:1.8.0_91]
at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
~[na:1.8.0_91]
at
org.subethamail.smtp.io.DotTerminatedInputStream.readWrappedStream(DotTerminatedInputStream.java:109)
~[subethasmtp-3.1.7.jar:June 16 2012]
at
org.subethamail.smtp.io.DotTerminatedInputStream.read(DotTerminatedInputStream.java:75)
~[subethasmtp-3.1.7.jar:June 16 2012]
at
org.subethamail.smtp.io.DotUnstuffingInputStream.read(DotUnstuffingInputStream.java:47)
~[subethasmtp-3.1.7.jar:June 16 2012]
at
org.subethamail.smtp.io.DotUnstuffingInputStream.read(DotUnstuffingInputStream.java:76)
~[subethasmtp-3.1.7.jar:June 16 2012]
at java.io.FilterInputStream.read(FilterInputStream.java:133)
~[na:1.8.0_91]
at
org.subethamail.smtp.io.ReceivedHeaderStream.read(ReceivedHeaderStream.java:131)
~[subethasmtp-3.1.7.jar:June 16 2012]
at
org.subethamail.smtp.io.ReceivedHeaderStream.read(ReceivedHeaderStream.java:146)
~[subethasmtp-3.1.7.jar:June 16 2012]
at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:2146)
~[commons-io-2.5.jar:2.5]
at org.apache.commons.io.IOUtils.copy(IOUtils.java:2102)
~[commons-io-2.5.jar:2.5]
at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:2123)
~[commons-io-2.5.jar:2.5]
at org.apache.commons.io.IOUtils.copy(IOUtils.java:2078)
~[commons-io-2.5.jar:2.5]
at
org.apache.nifi.processors.email.ListenSMTP$1.process(ListenSMTP.java:205)
~[nifi-email-processors-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
at
org.apache.nifi.controller.repository.StandardProcessSession.write(StandardProcessSession.java:2123)
~[nifi-framework-core-1.0.0-SNAPSHOT.jar:1.0.0-SNAPSHOT]
... 14 common frames omitted
```
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