Spring boot integration mail - authorization failed error - spring-integration

Question

Following is my spring configuration bean for pop3 connection,
#Bean
public IntegrationFlow mailListener() {
return IntegrationFlows.from(Mail.pop3InboundAdapter("pop3://sample.test:Sample2test_1#xxx.xx.x.xx/INBOX")
.shouldDeleteMessages(true).get(),
e -> e.poller(Pollers.fixedRate(5000).maxMessagesPerPoll(1)))
.<Message>handle((payload, header) -> logMail(payload))
.get();
}
Also double checked the credentials that looks good.
Getting the below exception,
2018-06-22 19:27:54.351 ERROR 2092 --- [ask-scheduler-2]
o.s.integration.handler.LoggingHandler :
org.springframework.messaging.MessagingException: failure occurred
while polling for mail; nested exception is
javax.mail.AuthenticationFailedException: authorization failed at
org.springframework.integration.mail.MailReceivingMessageSource.receive(MailReceivingMessageSource.java:131)
at
org.springframework.integration.endpoint.SourcePollingChannelAdapter.receiveMessage(SourcePollingChannelAdapter.java:224)
at
org.springframework.integration.endpoint.AbstractPollingEndpoint.doPoll(AbstractPollingEndpoint.java:245)
at
org.springframework.integration.endpoint.AbstractPollingEndpoint.access$000(AbstractPollingEndpoint.java:58)
at
org.springframework.integration.endpoint.AbstractPollingEndpoint$1.call(AbstractPollingEndpoint.java:190)
at
org.springframework.integration.endpoint.AbstractPollingEndpoint$1.call(AbstractPollingEndpoint.java:186)
at
org.springframework.integration.endpoint.AbstractPollingEndpoint$Poller$1.run(AbstractPollingEndpoint.java:353)
at
org.springframework.integration.util.ErrorHandlingTaskExecutor$1.run(ErrorHandlingTaskExecutor.java:55)
at
org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50)
at
org.springframework.integration.util.ErrorHandlingTaskExecutor.execute(ErrorHandlingTaskExecutor.java:51)
at
org.springframework.integration.endpoint.AbstractPollingEndpoint$Poller.run(AbstractPollingEndpoint.java:344)
at
org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
at
org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:81)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown
Source) at java.util.concurrent.FutureTask.run(Unknown Source) at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(Unknown
Source) at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown
Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown
Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
Source) at java.lang.Thread.run(Unknown Source) Caused by:
javax.mail.AuthenticationFailedException: authorization failed at
com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:208) at
javax.mail.Service.connect(Service.java:295) at
javax.mail.Service.connect(Service.java:176) at
javax.mail.Service.connect(Service.java:125) at
org.springframework.integration.mail.AbstractMailReceiver.connectStoreIfNecessary(AbstractMailReceiver.java:286)
at
org.springframework.integration.mail.AbstractMailReceiver.openFolder(AbstractMailReceiver.java:293)
at
org.springframework.integration.mail.AbstractMailReceiver.receive(AbstractMailReceiver.java:319)
at
org.springframework.integration.mail.MailReceivingMessageSource.receive(MailReceivingMessageSource.java:112)
... 19 more

Answer 1

There is an option like this:
/**
* The Java Mail properties.
* #param javaMailProperties the javaMailProperties.
* #return the spec.
* #see AbstractMailReceiver#setJavaMailProperties(Properties)
*/
public S javaMailProperties(Properties javaMailProperties) {
You can specify there mail.debug = true to trace what's going on with mail protocol during interaction.
UPDATE
We have this in your logs:
DEBUG POP3: connecting to host "172.16.1.45", port 995, isSSL false
19:54:46.746 [task-scheduler-1] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'errorChannel'
19:54:46.753 [task-scheduler-1] DEBUG org.springframework.integration.channel.PublishSubscribeChannel - preSend on channel 'errorChannel', message: ErrorMessage [payload=org.springframework.messaging.MessagingException: failure occurred while polling for mail; nested exception is javax.mail.MessagingException: Connect failed;
nested exception is:
java.net.ConnectException: Connection refused: connect, headers={id=290f4c5a-2dfe-d7cb-0637-a0e9f0394daa, timestamp=1529677486753}]
So, it can't just connect to the 172.16.1.45:995. There is no authentication handshake yet.