mail subsystem failing to start

[patdelaney]

I have added the correct mail server settings, but I am still getting this error in the logs. I'm not sure where to look next.:

13:23:15,181 ERROR [org.alfresco.repo.action.executer.MailActionExecuter] Failed to send email to pat.delaney@avid.com
org.springframework.mail.MailSendException: Failed messages: com.sun.mail.smtp.SMTPSendFailedException: 553 5.1.0 centos6 does not exist E2110
; message exception details (1) are:
Failed message 1:
com.sun.mail.smtp.SMTPSendFailedException: 553 5.1.0 centos6 does not exist E2110

   at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:1388)
   at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:959)
   at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:583)
   at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:416)
   at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:340)
   at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:336)
   at org.alfresco.repo.action.executer.MailActionExecuter.sendEmail(MailActionExecuter.java:632)
   at org.alfresco.repo.action.executer.MailActionExecuter.executeImpl(MailActionExecuter.java:338)
   at org.alfresco.repo.action.executer.ActionExecuterAbstractBase.execute(ActionExecuterAbstractBase.java:241)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:601)
   at org.alfresco.repo.management.subsystems.SubsystemProxyFactory$1.invoke(SubsystemProxyFactory.java:72)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
   at $Proxy230.execute(Unknown Source)
   at org.alfresco.repo.action.ActionServiceImpl.directActionExecution(ActionServiceImpl.java:822)
   at org.alfresco.repo.action.ActionServiceImpl.executeActionImpl(ActionServiceImpl.java:723)
   at org.alfresco.repo.action.ActionServiceImpl.executeAction(ActionServiceImpl.java:557)
   at org.alfresco.repo.action.ActionServiceImpl.executeAction(ActionServiceImpl.java:543)
   at org.alfresco.repo.action.ActionServiceImpl.executeAction(ActionServiceImpl.java:831)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:601)
   at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
   at org.alfresco.repo.security.permissions.impl.AlwaysProceedMethodInterceptor.invoke(AlwaysProceedMethodInterceptor.java:34)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.alfresco.repo.security.permissions.impl.ExceptionTranslatorMethodInterceptor.invoke(ExceptionTranslatorMethodInterceptor.java:46)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.alfresco.repo.audit.AuditMethodInterceptor.proceedWithAudit(AuditMethodInterceptor.java:245)
   at org.alfresco.repo.audit.AuditMethodInterceptor.proceed(AuditMethodInterceptor.java:211)
   at org.alfresco.repo.audit.AuditMethodInterceptor.invoke(AuditMethodInterceptor.java:164)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
   at $Proxy42.executeAction(Unknown Source)
   at org.alfresco.repo.activities.feed.EmailUserNotifier.notifyUser(EmailUserNotifier.java:161)
   at org.alfresco.repo.activities.feed.AbstractUserNotifier.notifyUser(AbstractUserNotifier.java:193)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1.processInternal(FeedNotifierImpl.java:309)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1.access$200(FeedNotifierImpl.java:269)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1$1.execute(FeedNotifierImpl.java:297)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1$1.execute(FeedNotifierImpl.java:294)
   at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:433)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1.process(FeedNotifierImpl.java:293)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1.process(FeedNotifierImpl.java:269)
   at org.alfresco.repo.batch.BatchProcessor$TxnCallback.execute(BatchProcessor.java:712)
   at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:433)
   at org.alfresco.repo.batch.BatchProcessor$TxnCallback.run(BatchProcessor.java:756)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
   at java.lang.Thread.run(Thread.java:722)
13:23:15,205 WARN  [org.alfresco.repo.activities.feed.FeedNotifier] FeedNotifier: Failed to process entry "Person pdelaney".
org.alfresco.error.AlfrescoRuntimeException: 08190001 Failed to send email to:pat.delaney@avid.com
   at org.alfresco.repo.action.executer.MailActionExecuter.sendEmail(MailActionExecuter.java:659)
   at org.alfresco.repo.action.executer.MailActionExecuter.executeImpl(MailActionExecuter.java:338)
   at org.alfresco.repo.action.executer.ActionExecuterAbstractBase.execute(ActionExecuterAbstractBase.java:241)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:601)
   at org.alfresco.repo.management.subsystems.SubsystemProxyFactory$1.invoke(SubsystemProxyFactory.java:72)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
   at $Proxy230.execute(Unknown Source)
   at org.alfresco.repo.action.ActionServiceImpl.directActionExecution(ActionServiceImpl.java:822)
   at org.alfresco.repo.action.ActionServiceImpl.executeActionImpl(ActionServiceImpl.java:723)
   at org.alfresco.repo.action.ActionServiceImpl.executeAction(ActionServiceImpl.java:557)
   at org.alfresco.repo.action.ActionServiceImpl.executeAction(ActionServiceImpl.java:543)
   at org.alfresco.repo.action.ActionServiceImpl.executeAction(ActionServiceImpl.java:831)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:601)
   at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
   at org.alfresco.repo.security.permissions.impl.AlwaysProceedMethodInterceptor.invoke(AlwaysProceedMethodInterceptor.java:34)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.alfresco.repo.security.permissions.impl.ExceptionTranslatorMethodInterceptor.invoke(ExceptionTranslatorMethodInterceptor.java:46)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.alfresco.repo.audit.AuditMethodInterceptor.proceedWithAudit(AuditMethodInterceptor.java:245)
   at org.alfresco.repo.audit.AuditMethodInterceptor.proceed(AuditMethodInterceptor.java:211)
   at org.alfresco.repo.audit.AuditMethodInterceptor.invoke(AuditMethodInterceptor.java:164)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
   at $Proxy42.executeAction(Unknown Source)
   at org.alfresco.repo.activities.feed.EmailUserNotifier.notifyUser(EmailUserNotifier.java:161)
   at org.alfresco.repo.activities.feed.AbstractUserNotifier.notifyUser(AbstractUserNotifier.java:193)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1.processInternal(FeedNotifierImpl.java:309)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1.access$200(FeedNotifierImpl.java:269)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1$1.execute(FeedNotifierImpl.java:297)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1$1.execute(FeedNotifierImpl.java:294)
   at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:433)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1.process(FeedNotifierImpl.java:293)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1.process(FeedNotifierImpl.java:269)
   at org.alfresco.repo.batch.BatchProcessor$TxnCallback.execute(BatchProcessor.java:712)
   at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:433)
   at org.alfresco.repo.batch.BatchProcessor$TxnCallback.run(BatchProcessor.java:756)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
   at java.lang.Thread.run(Thread.java:722)
Caused by: org.springframework.mail.MailSendException: Failed messages: com.sun.mail.smtp.SMTPSendFailedException: 553 5.1.0 centos6 does not exist E2110
; message exceptions (1) are:
Failed message 1: com.sun.mail.smtp.SMTPSendFailedException: 553 5.1.0 centos6 does not exist E2110

   at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:440)
   at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:340)
   at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:336)
   at org.alfresco.repo.action.executer.MailActionExecuter.sendEmail(MailActionExecuter.java:632)
   … 49 more
13:23:16,369 INFO  [org.alfresco.repo.thumbnail.ThumbnailRegistry] Init'ed thumbnail defs in 4373 ms
13:23:17,374 ERROR [org.alfresco.repo.action.executer.MailActionExecuter] Failed to send email to pat.delaney@avid.com
org.springframework.mail.MailSendException: Failed messages: com.sun.mail.smtp.SMTPSendFailedException: 553 5.1.0 centos6 does not exist E2110
; message exception details (1) are:
Failed message 1:
com.sun.mail.smtp.SMTPSendFailedException: 553 5.1.0 centos6 does not exist E2110

   at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:1388)
   at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:959)
   at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:583)
   at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:416)
   at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:340)
   at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:336)
   at org.alfresco.repo.action.executer.MailActionExecuter.sendEmail(MailActionExecuter.java:632)
   at org.alfresco.repo.action.executer.MailActionExecuter.executeImpl(MailActionExecuter.java:338)
   at org.alfresco.repo.action.executer.ActionExecuterAbstractBase.execute(ActionExecuterAbstractBase.java:241)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:601)
   at org.alfresco.repo.management.subsystems.SubsystemProxyFactory$1.invoke(SubsystemProxyFactory.java:72)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
   at $Proxy230.execute(Unknown Source)
   at org.alfresco.repo.action.ActionServiceImpl.directActionExecution(ActionServiceImpl.java:822)
   at org.alfresco.repo.action.ActionServiceImpl.executeActionImpl(ActionServiceImpl.java:723)
   at org.alfresco.repo.action.ActionServiceImpl.executeAction(ActionServiceImpl.java:557)
   at org.alfresco.repo.action.ActionServiceImpl.executeAction(ActionServiceImpl.java:543)
   at org.alfresco.repo.action.ActionServiceImpl.executeAction(ActionServiceImpl.java:831)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:601)
   at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
   at org.alfresco.repo.security.permissions.impl.AlwaysProceedMethodInterceptor.invoke(AlwaysProceedMethodInterceptor.java:34)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.alfresco.repo.security.permissions.impl.ExceptionTranslatorMethodInterceptor.invoke(ExceptionTranslatorMethodInterceptor.java:46)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.alfresco.repo.audit.AuditMethodInterceptor.proceedWithAudit(AuditMethodInterceptor.java:245)
   at org.alfresco.repo.audit.AuditMethodInterceptor.proceed(AuditMethodInterceptor.java:211)
   at org.alfresco.repo.audit.AuditMethodInterceptor.invoke(AuditMethodInterceptor.java:164)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
   at $Proxy42.executeAction(Unknown Source)
   at org.alfresco.repo.activities.feed.EmailUserNotifier.notifyUser(EmailUserNotifier.java:161)
   at org.alfresco.repo.activities.feed.AbstractUserNotifier.notifyUser(AbstractUserNotifier.java:193)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1.processInternal(FeedNotifierImpl.java:309)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1.access$200(FeedNotifierImpl.java:269)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1$1.execute(FeedNotifierImpl.java:297)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1$1.execute(FeedNotifierImpl.java:294)
   at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:433)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1.process(FeedNotifierImpl.java:293)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1.process(FeedNotifierImpl.java:269)
   at org.alfresco.repo.batch.BatchProcessor$TxnCallback.execute(BatchProcessor.java:712)
   at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:433)
   at org.alfresco.repo.batch.BatchProcessor$TxnCallback.run(BatchProcessor.java:756)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
   at java.lang.Thread.run(Thread.java:722)
13:23:17,380 WARN  [org.alfresco.repo.activities.feed.FeedNotifier] FeedNotifier: Failed to process entry "Person amg".
org.alfresco.error.AlfrescoRuntimeException: 08190002 Failed to send email to:pat.delaney@avid.com
   at org.alfresco.repo.action.executer.MailActionExecuter.sendEmail(MailActionExecuter.java:659)
   at org.alfresco.repo.action.executer.MailActionExecuter.executeImpl(MailActionExecuter.java:338)
   at org.alfresco.repo.action.executer.ActionExecuterAbstractBase.execute(ActionExecuterAbstractBase.java:241)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:601)
   at org.alfresco.repo.management.subsystems.SubsystemProxyFactory$1.invoke(SubsystemProxyFactory.java:72)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
   at $Proxy230.execute(Unknown Source)
   at org.alfresco.repo.action.ActionServiceImpl.directActionExecution(ActionServiceImpl.java:822)
   at org.alfresco.repo.action.ActionServiceImpl.executeActionImpl(ActionServiceImpl.java:723)
   at org.alfresco.repo.action.ActionServiceImpl.executeAction(ActionServiceImpl.java:557)
   at org.alfresco.repo.action.ActionServiceImpl.executeAction(ActionServiceImpl.java:543)
   at org.alfresco.repo.action.ActionServiceImpl.executeAction(ActionServiceImpl.java:831)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:601)
   at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
   at org.alfresco.repo.security.permissions.impl.AlwaysProceedMethodInterceptor.invoke(AlwaysProceedMethodInterceptor.java:34)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.alfresco.repo.security.permissions.impl.ExceptionTranslatorMethodInterceptor.invoke(ExceptionTranslatorMethodInterceptor.java:46)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.alfresco.repo.audit.AuditMethodInterceptor.proceedWithAudit(AuditMethodInterceptor.java:245)
   at org.alfresco.repo.audit.AuditMethodInterceptor.proceed(AuditMethodInterceptor.java:211)
   at org.alfresco.repo.audit.AuditMethodInterceptor.invoke(AuditMethodInterceptor.java:164)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
   at $Proxy42.executeAction(Unknown Source)
   at org.alfresco.repo.activities.feed.EmailUserNotifier.notifyUser(EmailUserNotifier.java:161)
   at org.alfresco.repo.activities.feed.AbstractUserNotifier.notifyUser(AbstractUserNotifier.java:193)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1.processInternal(FeedNotifierImpl.java:309)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1.access$200(FeedNotifierImpl.java:269)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1$1.execute(FeedNotifierImpl.java:297)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1$1.execute(FeedNotifierImpl.java:294)
   at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:433)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1.process(FeedNotifierImpl.java:293)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1.process(FeedNotifierImpl.java:269)
   at org.alfresco.repo.batch.BatchProcessor$TxnCallback.execute(BatchProcessor.java:712)
   at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:433)
   at org.alfresco.repo.batch.BatchProcessor$TxnCallback.run(BatchProcessor.java:756)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
   at java.lang.Thread.run(Thread.java:722)
Caused by: org.springframework.mail.MailSendException: Failed messages: com.sun.mail.smtp.SMTPSendFailedException: 553 5.1.0 centos6 does not exist E2110
; message exceptions (1) are:
Failed message 1: com.sun.mail.smtp.SMTPSendFailedException: 553 5.1.0 centos6 does not exist E2110

   at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:440)
   at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:340)
   at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:336)
   at org.alfresco.repo.action.executer.MailActionExecuter.sendEmail(MailActionExecuter.java:632)
   … 49 more
13:23:17,396 ERROR [org.alfresco.repo.activities.feed.FeedNotifier] FeedNotifier: 2 error(s) detected. Last error from entry "Person amg"
org.alfresco.error.AlfrescoRuntimeException: 08190002 Failed to send email to:pat.delaney@avid.com
   at org.alfresco.repo.action.executer.MailActionExecuter.sendEmail(MailActionExecuter.java:659)
   at org.alfresco.repo.action.executer.MailActionExecuter.executeImpl(MailActionExecuter.java:338)
   at org.alfresco.repo.action.executer.ActionExecuterAbstractBase.execute(ActionExecuterAbstractBase.java:241)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:601)
   at org.alfresco.repo.management.subsystems.SubsystemProxyFactory$1.invoke(SubsystemProxyFactory.java:72)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
   at $Proxy230.execute(Unknown Source)
   at org.alfresco.repo.action.ActionServiceImpl.directActionExecution(ActionServiceImpl.java:822)
   at org.alfresco.repo.action.ActionServiceImpl.executeActionImpl(ActionServiceImpl.java:723)
   at org.alfresco.repo.action.ActionServiceImpl.executeAction(ActionServiceImpl.java:557)
   at org.alfresco.repo.action.ActionServiceImpl.executeAction(ActionServiceImpl.java:543)
   at org.alfresco.repo.action.ActionServiceImpl.executeAction(ActionServiceImpl.java:831)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:601)
   at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
   at org.alfresco.repo.security.permissions.impl.AlwaysProceedMethodInterceptor.invoke(AlwaysProceedMethodInterceptor.java:34)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.alfresco.repo.security.permissions.impl.ExceptionTranslatorMethodInterceptor.invoke(ExceptionTranslatorMethodInterceptor.java:46)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.alfresco.repo.audit.AuditMethodInterceptor.proceedWithAudit(AuditMethodInterceptor.java:245)
   at org.alfresco.repo.audit.AuditMethodInterceptor.proceed(AuditMethodInterceptor.java:211)
   at org.alfresco.repo.audit.AuditMethodInterceptor.invoke(AuditMethodInterceptor.java:164)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
   at $Proxy42.executeAction(Unknown Source)
   at org.alfresco.repo.activities.feed.EmailUserNotifier.notifyUser(EmailUserNotifier.java:161)
   at org.alfresco.repo.activities.feed.AbstractUserNotifier.notifyUser(AbstractUserNotifier.java:193)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1.processInternal(FeedNotifierImpl.java:309)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1.access$200(FeedNotifierImpl.java:269)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1$1.execute(FeedNotifierImpl.java:297)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1$1.execute(FeedNotifierImpl.java:294)
   at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:433)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1.process(FeedNotifierImpl.java:293)
   at org.alfresco.repo.activities.feed.FeedNotifierImpl$1.process(FeedNotifierImpl.java:269)
   at org.alfresco.repo.batch.BatchProcessor$TxnCallback.execute(BatchProcessor.java:712)
   at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:433)
   at org.alfresco.repo.batch.BatchProcessor$TxnCallback.run(BatchProcessor.java:756)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
   at java.lang.Thread.run(Thread.java:722)
Caused by: org.springframework.mail.MailSendException: Failed messages: com.sun.mail.smtp.SMTPSendFailedException: 553 5.1.0 centos6 does not exist E2110
; message exceptions (1) are:
Failed message 1: com.sun.mail.smtp.SMTPSendFailedException: 553 5.1.0 centos6 does not exist E2110

   at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:440)
   at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:340)
   at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:336)
   at org.alfresco.repo.action.executer.MailActionExecuter.sendEmail(MailActionExecuter.java:632)
   … 49 more

[mrogers]

Please post your configuration, especially that concerned with email.

What is "centos6" either that's the wrong value or the centos server can't resolve its own name.   CentOS seems a bit prone to having problems resolving its own name,  it may need an extra line added to your "hosts" file.