Randomly some Emails are not being sent to the users using Send Email Smart service

In my application I have used Send Email Smart Service to send Emails to users but for some random requests that node is breaking and mail is not being sent to the users and If the node is restarted then it proceeds ahead without any error in Monitoring mode.

SMTP server configurations also looks fine in custom.properties file.

I have gone through the Server logs and below is the error for one of the such stuck request.

aused by: com.sun.mail.smtp.SMTPSendFailedException: [EOF]
	at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:2114) [mail-1.4.5.redhat-2.jar:1.4.5.redhat-2]
	at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1618) [mail-1.4.5.redhat-2.jar:1.4.5.redhat-2]
	at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1119) [mail-1.4.5.redhat-2.jar:1.4.5.redhat-2]
	at com.appiancorp.ap2.mail.Mail.sendMessage(Mail.java:349) [appian-ap.jar:]
	at com.appiancorp.ap2.mail.Mail.sendMessage(Mail.java:133) [appian-ap.jar:]
	at com.appiancorp.ap2.mail.Mail.sendMailWithAttachment(Mail.java:200) [appian-ap.jar:]
	at com.appiancorp.ap2.mail.Mail.sendMail(Mail.java:162) [appian-ap.jar:]
	at com.appiancorp.process.engine.AbstractMailRequest.sendEmail(AbstractMailRequest.java:227) [appian-process.jar:]
16:10:42,670 INFO  [stdout] (ajp-/0.0.0.0:8009-5) 402848 46
16:11:30,903 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 2018-08-23 16:11:30,903 [Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest] ERROR com.appiancorp.ap2.mail.Mail - Could not send mail via eudsmtp.kxxxnet.com:25 to 
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 2018-08-23 16:11:30,903 [Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest] ERROR com.appiancorp.process.runtime.activities.SendEmailActivity - com.sun.mail.smtp.SMTPSendFailedException: [EOF]
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) com.sun.mail.smtp.SMTPSendFailedException: [EOF]
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:2114)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1618)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1119)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.ap2.mail.Mail.sendMessage(Mail.java:349)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.ap2.mail.Mail.sendMessage(Mail.java:220)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.ap2.mail.Emailer.send(Emailer.java:124)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.ap2.mail.Emailer.send(Emailer.java:119)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.process.runtime.activities.SendEmailActivity.execute(SendEmailActivity.java:371)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.suiteapi.process.framework.AbstractActivity.perform(AbstractActivity.java:104)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.process.runtime.framework.LegacyActivityExecutor$2.call(LegacyActivityExecutor.java:90)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.process.runtime.framework.LegacyActivityExecutor$2.call(LegacyActivityExecutor.java:87)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.common.ContextClassLoaderSwitcher.runInContext(ContextClassLoaderSwitcher.java:25)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.process.runtime.framework.LegacyActivityExecutor.execute(LegacyActivityExecutor.java:87)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute(UnattendedJavaActivityRequest.java:83)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute0(UnattendedJavaActivityRequest.java:55)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.process.engine.ContinuationRequest.executeOuter(ContinuationRequest.java:71)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.process.engine.ContinuationRequest.execute(ContinuationRequest.java:85)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.mdb.UnattendedRequestHandlerBean.onMessage(UnattendedRequestHandlerBean.java:37)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at sun.reflect.GeneratedMethodAccessor1820.invoke(Unknown Source)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at java.lang.reflect.Method.invoke(Method.java:498)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ee.component.ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptor.java:52)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,904 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:63)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:63)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.component.invocationmetrics.ExecutionTimeInterceptor.processInvocation(ExecutionTimeInterceptor.java:43)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.tx.EjbBMTInterceptor.handleInvocation(EjbBMTInterceptor.java:104)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.tx.BMTInterceptor.processInvocation(BMTInterceptor.java:60)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InitialInterceptor.processInvocation(InitialInterceptor.java:21)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ee.component.interceptors.ComponentDispatcherInterceptor.processInvocation(ComponentDispatcherInterceptor.java:53)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.component.pool.PooledInstanceInterceptor.processInvocation(PooledInstanceInterceptor.java:51)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.component.invocationmetrics.WaitTimeInterceptor.processInvocation(WaitTimeInterceptor.java:43)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.security.SecurityContextInterceptor.processInvocation(SecurityContextInterceptor.java:89)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.deployment.processors.StartupAwaitInterceptor.processInvocation(StartupAwaitInterceptor.java:22)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.component.interceptors.ShutDownInterceptorFactory$1.processInvocation(ShutDownInterceptorFactory.java:64)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.component.interceptors.LoggingInterceptor.processInvocation(LoggingInterceptor.java:59)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,905 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.component.interceptors.AdditionalSetupInterceptor.processInvocation(AdditionalSetupInterceptor.java:55)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.component.messagedriven.MessageDrivenComponentDescription$5$1.processInvocation(MessageDrivenComponentDescription.java:203)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ee.component.TCCLInterceptor.processInvocation(TCCLInterceptor.java:45)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ee.component.ViewService$View.invoke(ViewService.java:189)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ee.component.ViewDescription$1.processInvocation(ViewDescription.java:185)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ee.component.ProxyInvocationHandler.invoke(ProxyInvocationHandler.java:73)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.ra.workpoller.UnattendedRequestListener$$$view1.onMessage(Unknown Source)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at sun.reflect.GeneratedMethodAccessor1819.invoke(Unknown Source)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at java.lang.reflect.Method.invoke(Method.java:498)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.inflow.MessageEndpointInvocationHandler.doInvoke(MessageEndpointInvocationHandler.java:140)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.inflow.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:73)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.sun.proxy.$Proxy516.onMessage(Unknown Source)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.ra.workpoller.WorkItem.run(WorkItem.java:59)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.jca.core.workmanager.WorkWrapper.run(WorkWrapper.java:215)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.threads.SimpleDirectExecutor.execute(SimpleDirectExecutor.java:33)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.threads.QueueExecutor.runTask(QueueExecutor.java:808)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.threads.QueueExecutor.access$100(QueueExecutor.java:45)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.threads.QueueExecutor$Worker.run(QueueExecutor.java:849)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at java.lang.Thread.run(Thread.java:748)
16:11:30,906 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.threads.JBossThread.run(JBossThread.java:122)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 2018-08-23 16:11:30,906 [Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest] ERROR com.appiancorp.process.engine.UnattendedJavaActivityRequest - An error occurred while executing activity: id=1074343284, classname=com.appiancorp.process.runtime.activities.SendEmailActivity
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) com.appiancorp.suiteapi.process.framework.ActivityExecutionException: Failed to send email
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.process.runtime.activities.SendEmailActivity.throwException(SendEmailActivity.java:553)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.process.runtime.activities.SendEmailActivity.execute(SendEmailActivity.java:378)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.suiteapi.process.framework.AbstractActivity.perform(AbstractActivity.java:104)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.process.runtime.framework.LegacyActivityExecutor$2.call(LegacyActivityExecutor.java:90)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.process.runtime.framework.LegacyActivityExecutor$2.call(LegacyActivityExecutor.java:87)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.common.ContextClassLoaderSwitcher.runInContext(ContextClassLoaderSwitcher.java:25)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.process.runtime.framework.LegacyActivityExecutor.execute(LegacyActivityExecutor.java:87)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute(UnattendedJavaActivityRequest.java:83)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute0(UnattendedJavaActivityRequest.java:55)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.process.engine.ContinuationRequest.executeOuter(ContinuationRequest.java:71)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.process.engine.ContinuationRequest.execute(ContinuationRequest.java:85)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.mdb.UnattendedRequestHandlerBean.onMessage(UnattendedRequestHandlerBean.java:37)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at sun.reflect.GeneratedMethodAccessor1820.invoke(Unknown Source)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at java.lang.reflect.Method.invoke(Method.java:498)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ee.component.ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptor.java:52)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:63)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53)
16:11:30,907 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:63)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.component.invocationmetrics.ExecutionTimeInterceptor.processInvocation(ExecutionTimeInterceptor.java:43)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.tx.EjbBMTInterceptor.handleInvocation(EjbBMTInterceptor.java:104)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.tx.BMTInterceptor.processInvocation(BMTInterceptor.java:60)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InitialInterceptor.processInvocation(InitialInterceptor.java:21)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ee.component.interceptors.ComponentDispatcherInterceptor.processInvocation(ComponentDispatcherInterceptor.java:53)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.component.pool.PooledInstanceInterceptor.processInvocation(PooledInstanceInterceptor.java:51)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.component.invocationmetrics.WaitTimeInterceptor.processInvocation(WaitTimeInterceptor.java:43)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.security.SecurityContextInterceptor.processInvocation(SecurityContextInterceptor.java:89)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.deployment.processors.StartupAwaitInterceptor.processInvocation(StartupAwaitInterceptor.java:22)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.component.interceptors.ShutDownInterceptorFactory$1.processInvocation(ShutDownInterceptorFactory.java:64)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.component.interceptors.LoggingInterceptor.processInvocation(LoggingInterceptor.java:59)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.component.interceptors.AdditionalSetupInterceptor.processInvocation(AdditionalSetupInterceptor.java:55)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,908 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.component.messagedriven.MessageDrivenComponentDescription$5$1.processInvocation(MessageDrivenComponentDescription.java:203)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ee.component.TCCLInterceptor.processInvocation(TCCLInterceptor.java:45)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ee.component.ViewService$View.invoke(ViewService.java:189)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ee.component.ViewDescription$1.processInvocation(ViewDescription.java:185)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ee.component.ProxyInvocationHandler.invoke(ProxyInvocationHandler.java:73)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.ra.workpoller.UnattendedRequestListener$$$view1.onMessage(Unknown Source)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at sun.reflect.GeneratedMethodAccessor1819.invoke(Unknown Source)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at java.lang.reflect.Method.invoke(Method.java:498)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.inflow.MessageEndpointInvocationHandler.doInvoke(MessageEndpointInvocationHandler.java:140)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.as.ejb3.inflow.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:73)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.sun.proxy.$Proxy516.onMessage(Unknown Source)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.ra.workpoller.WorkItem.run(WorkItem.java:59)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.jca.core.workmanager.WorkWrapper.run(WorkWrapper.java:215)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.threads.SimpleDirectExecutor.execute(SimpleDirectExecutor.java:33)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.threads.QueueExecutor.runTask(QueueExecutor.java:808)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.threads.QueueExecutor.access$100(QueueExecutor.java:45)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.threads.QueueExecutor$Worker.run(QueueExecutor.java:849)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at java.lang.Thread.run(Thread.java:748)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at org.jboss.threads.JBossThread.run(JBossThread.java:122)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) Caused by: com.sun.mail.smtp.SMTPSendFailedException: [EOF]
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:2114)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1618)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1119)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.ap2.mail.Mail.sendMessage(Mail.java:349)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.ap2.mail.Mail.sendMessage(Mail.java:220)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.ap2.mail.Emailer.send(Emailer.java:124)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.ap2.mail.Emailer.send(Emailer.java:119)
16:11:30,909 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	at com.appiancorp.process.runtime.activities.SendEmailActivity.execute(SendEmailActivity.java:371)
16:11:30,910 INFO  [stdout] (Appian Work Item - 6837978 - ProcessExec04 : UnattendedJavaActivityRequest) 	... 74 more
16:11:31,228 INFO  [stdout] (Appian Work Item - 6837979 - NotificationsEmail : MailRequest) 2018-08-23 16:11:31,228 [Appian Work Item - 6837979 - NotificationsEmail : MailRequest] ERROR com.appiancorp.ap2.mail.Mail - Could not send mail via eudsmtp.kxxxnet.com:25 to 
16:11:31,252 INFO  [stdout] (Appian Work Item - 6837979 - NotificationsEmail : MailRequest) 2018-08-23 16:11:31,251 [Appian Work Item - 6837979 - NotificationsEmail : MailRequest] ERROR com.appiancorp.ap2.mail.Mail - Could not send mail via eudsmtp.kxxxnet.com:25 to 
16:11:31,276 INFO  [stdout] (Appian Work Item - 6837979 - NotificationsEmail : MailRequest) 2018-08-23 16:11:31,276 [Appian Work Item - 6837979 - NotificationsEmail : MailRequest] ERROR com.appiancorp.ap2.mail.Mail - Could not send mail via eudsmtp.kxxxnet.com:25 to 
16:11:31,582 ERROR [org.jboss.as.ejb3.invocation] (Appian Work Item - 6837979 - NotificationsEmail) JBAS014134: EJB Invocation failed on component UnattendedRequestHandlerBean for method public abstract com.appiancorp.process.engine.ContinuationResponse com.appiancorp.ra.workpoller.UnattendedRequestListener.onMessage(com.appiancorp.process.engine.UnattendedRequest): javax.ejb.EJBException: com.appiancorp.process.engine.EmailSendException: Could not send email [from=appian@kxxx.com, to=appian@kxxxnet.com, subject=Error in Task: Send E-Mail]
	at org.jboss.as.ejb3.tx.BMTInterceptor.handleException(BMTInterceptor.java:85) [jboss-as-ejb3-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.as.ejb3.tx.EjbBMTInterceptor.checkStatelessDone(EjbBMTInterceptor.java:92) [jboss-as-ejb3-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.as.ejb3.tx.EjbBMTInterceptor.handleInvocation(EjbBMTInterceptor.java:107) [jboss-as-ejb3-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.as.ejb3.tx.BMTInterceptor.processInvocation(BMTInterceptor.java:60) [jboss-as-ejb3-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.invocation.InitialInterceptor.processInvocation(InitialInterceptor.java:21) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.as.ee.component.interceptors.ComponentDispatcherInterceptor.processInvocation(ComponentDispatcherInterceptor.java:53) [jboss-as-ee-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.as.ejb3.component.pool.PooledInstanceInterceptor.processInvocation(PooledInstanceInterceptor.java:51) [jboss-as-ejb3-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41) [jboss-as-ejb3-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.as.ejb3.component.invocationmetrics.WaitTimeInterceptor.processInvocation(WaitTimeInterceptor.java:43) [jboss-as-ejb3-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.as.ejb3.security.SecurityContextInterceptor.processInvocation(SecurityContextInterceptor.java:89) [jboss-as-ejb3-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.as.ejb3.deployment.processors.StartupAwaitInterceptor.processInvocation(StartupAwaitInterceptor.java:22) [jboss-as-ejb3-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.as.ejb3.component.interceptors.ShutDownInterceptorFactory$1.processInvocation(ShutDownInterceptorFactory.java:64) [jboss-as-ejb3-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.as.ejb3.component.interceptors.LoggingInterceptor.processInvocation(LoggingInterceptor.java:59) [jboss-as-ejb3-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50) [jboss-as-ee-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.as.ejb3.component.interceptors.AdditionalSetupInterceptor.processInvocation(AdditionalSetupInterceptor.java:55) [jboss-as-ejb3-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.as.ejb3.component.messagedriven.MessageDrivenComponentDescription$5$1.processInvocation(MessageDrivenComponentDescription.java:203) [jboss-as-ejb3-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.as.ee.component.TCCLInterceptor.processInvocation(TCCLInterceptor.java:45) [jboss-as-ee-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.as.ee.component.ViewService$View.invoke(ViewService.java:189) [jboss-as-ee-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.as.ee.component.ViewDescription$1.processInvocation(ViewDescription.java:185) [jboss-as-ee-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.as.ee.component.ProxyInvocationHandler.invoke(ProxyInvocationHandler.java:73) [jboss-as-ee-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at com.appiancorp.ra.workpoller.UnattendedRequestListener$$$view1.onMessage(Unknown Source) [appian-ra.jar:]
	at sun.reflect.GeneratedMethodAccessor1819.invoke(Unknown Source) [:1.8.0_144]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.8.0_144]
	at java.lang.reflect.Method.invoke(Method.java:498) [rt.jar:1.8.0_144]
	at org.jboss.as.ejb3.inflow.MessageEndpointInvocationHandler.doInvoke(MessageEndpointInvocationHandler.java:140) [jboss-as-ejb3-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.as.ejb3.inflow.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:73) [jboss-as-ejb3-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at com.sun.proxy.$Proxy516.onMessage(Unknown Source)
	at com.appiancorp.ra.workpoller.WorkItem.run(WorkItem.java:59) [appian-ra.jar:]
	at org.jboss.jca.core.workmanager.WorkWrapper.run(WorkWrapper.java:215) [ironjacamar-core-impl-1.0.37.Final-redhat-1.jar:1.0.37.Final-redhat-1]
	at org.jboss.threads.SimpleDirectExecutor.execute(SimpleDirectExecutor.java:33)
	at org.jboss.threads.QueueExecutor.runTask(QueueExecutor.java:808)
	at org.jboss.threads.QueueExecutor.access$100(QueueExecutor.java:45)
	at org.jboss.threads.QueueExecutor$Worker.run(QueueExecutor.java:849)
	at java.lang.Thread.run(Thread.java:748) [rt.jar:1.8.0_144]
	at org.jboss.threads.JBossThread.run(JBossThread.java:122)
Caused by: com.appiancorp.process.engine.EmailSendException: Could not send email [from=appian@kxxx.com, to=appian@kxxx.com, subject=Error in Task: Send E-Mail]
	at com.appiancorp.process.engine.AbstractMailRequest.sendEmail(AbstractMailRequest.java:230) [appian-process.jar:]
	at com.appiancorp.process.engine.AbstractMailRequest.execute0(AbstractMailRequest.java:189) [appian-process.jar:]
	at com.appiancorp.process.engine.ContinuationRequest.executeOuter(ContinuationRequest.java:71) [appian-process.jar:]
	at com.appiancorp.process.engine.ContinuationRequest.execute(ContinuationRequest.java:85) [appian-process.jar:]
	at com.appiancorp.mdb.UnattendedRequestHandlerBean.onMessage(UnattendedRequestHandlerBean.java:37) [unattended-request-handler.jar:]
	at sun.reflect.GeneratedMethodAccessor1820.invoke(Unknown Source) [:1.8.0_144]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.8.0_144]
	at java.lang.reflect.Method.invoke(Method.java:498) [rt.jar:1.8.0_144]
	at org.jboss.as.ee.component.ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptor.java:52) [jboss-as-ee-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:63) [jboss-as-ee-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:63) [jboss-as-ee-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.as.ejb3.component.invocationmetrics.ExecutionTimeInterceptor.processInvocation(ExecutionTimeInterceptor.java:43) [jboss-as-ejb3-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.3.Final-redhat-1.jar:1.1.3.Final-redhat-1]
	at org.jboss.as.ejb3.tx.EjbBMTInterceptor.handleInvocation(EjbBMTInterceptor.java:104) [jboss-as-ejb3-7.5.14.Final-redhat-2.jar:7.5.14.Final-redhat-2]
	... 50 more
Caused by: com.sun.mail.smtp.SMTPSendFailedException: [EOF]
	at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:2114) [mail-1.4.5.redhat-2.jar:1.4.5.redhat-2]
	at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1618) [mail-1.4.5.redhat-2.jar:1.4.5.redhat-2]
	at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1119) [mail-1.4.5.redhat-2.jar:1.4.5.redhat-2]
	at com.appiancorp.ap2.mail.Mail.sendMessage(Mail.java:349) [appian-ap.jar:]
	at com.appiancorp.ap2.mail.Mail.sendMessage(Mail.java:133) [appian-ap.jar:]
	at com.appiancorp.ap2.mail.Mail.sendMailWithAttachment(Mail.java:200) [appian-ap.jar:]
	at com.appiancorp.ap2.mail.Mail.sendMail(Mail.java:162) [appian-ap.jar:]
	at com.appiancorp.process.engine.AbstractMailRequest.sendEmail(AbstractMailRequest.java:227) [appian-process.jar:]
	... 68 more

 

Not sure why it is happening randomly. Please find the complete server log for this error in attachment.

 

Any suggestion is appreciated!!

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