Hi,
We are on Appian cloud with an external mail server.
Sometimes we see in the logs a java trace with 421 too many commands error like the example below.
Any ideas?
2018-11-12 10:46:02,554 [ThreadPoolTaskExecutor-9452] ERROR com.appiancorp.process.workpoller.WorkItemListener - The following exception occurred while attempting to complete work item [(WorkId: 2, WorkType: MailRequest{subjectWithoutPrefix=New Task Assigned to Me and Others., subject=, body=MailBody{filename=/ntf/emailHtml/newTaskOthers_emailHtml.jsp}, from=our email address, toUsernames=[Destination usernames], to=}, Response: null, ServerName: notifications-email)] - Exception: javax.resource.spi.work.WorkCompletedException: com.appiancorp.process.engine.EmailSendException: Could not send email [from=our mailbox, to=Destination email addresses, subject=New Task: PDB000277 - Manage Communications] at org.springframework.jca.work.SimpleTaskWorkManager$DelegatingWorkAdapter.run(SimpleTaskWorkManager.java:242) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)Caused by: com.appiancorp.process.engine.EmailSendException: Could not send email [from=privacyapps.our mailbox, to=Destination email addresses, subject=New Task: PDB000277 - Manage Communications] at com.appiancorp.process.engine.AbstractMailRequest.sendEmail(AbstractMailRequest.java:273) at com.appiancorp.process.engine.AbstractMailRequest.execute0(AbstractMailRequest.java:232) at com.appiancorp.process.engine.ContinuationRequest.executeOuter(ContinuationRequest.java:71) at com.appiancorp.process.engine.ContinuationRequest.execute(ContinuationRequest.java:90) at com.appiancorp.process.workpoller.UnattendedRequestHandlerBean.onMessage(UnattendedRequestHandlerBean.java:35) at com.appiancorp.process.workpoller.WorkItem.run(WorkItem.java:59) at org.springframework.jca.work.SimpleTaskWorkManager$DelegatingWorkAdapter.run(SimpleTaskWorkManager.java:239) ... 3 moreCaused by: javax.mail.AuthenticationFailedException: 421 too many commands at com.sun.mail.smtp.SMTPTransport$Authenticator.authenticate(SMTPTransport.java:823) at com.sun.mail.smtp.SMTPTransport.authenticate(SMTPTransport.java:756) at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:673) at javax.mail.Service.connect(Service.java:295) at com.appiancorp.ap2.mail.Mail.sendMessage(Mail.java:328) at com.appiancorp.ap2.mail.Mail.sendMessage(Mail.java:133) at com.appiancorp.ap2.mail.Mail.sendMailWithAttachment(Mail.java:200) at com.appiancorp.ap2.mail.Mail.sendMail(Mail.java:162) at com.appiancorp.process.engine.AbstractMailRequest.sendEmail(AbstractMailRequest.java:270) ... 9 more
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