Email notifications are delayed or not sending due to mail server responding with temporary failures
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Problem
Outgoing email notifications in JIRA are either severely delayed or not sending at all.
The following appears in the atlassian-jira-outgoing-mail.log
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ERROR [] Sending mailitem To='person@domain.atl' Subject='jira issue' From='null' FromName='Person, A' Cc='null' Bcc='null' ReplyTo='null' InReplyTo='<JIRA.350489.1498827497000@Atlassian.JIRA>' MimeType='text/html' Encoding='UTF-8' Multipart='javax.mail.internet.MimeMultipart@33d7a7e5' MessageId='null' ExcludeSubjectPrefix=false' anonymous Mail Queue Service Error occurred in sending e-mail: To='person@domain.atl' Subject='jira issue' From='null' FromName='Person, A' Cc='null' Bcc='null' ReplyTo='null' InReplyTo='<JIRA.350489.1498827497000@Atlassian.JIRA>' MimeType='text/html' Encoding='UTF-8' Multipart='javax.mail.internet.MimeMultipart@33d7a7e5' MessageId='null' ExcludeSubjectPrefix=false'
com.atlassian.mail.MailException: com.sun.mail.smtp.SMTPSendFailedException: 451 4.7.500 Server busy. Please try again later
at com.atlassian.mail.server.impl.SMTPMailServerImpl.sendWithMessageId(SMTPMailServerImpl.java:225) [atlassian-mail-2.7.18.jar:?]
at com.atlassian.mail.queue.SingleMailQueueItem.send(SingleMailQueueItem.java:44) [atlassian-mail-2.7.18.jar:?]
at com.atlassian.mail.queue.MailQueueImpl.sendBufferUnderLock(MailQueueImpl.java:103) [atlassian-mail-2.7.18.jar:?]
at com.atlassian.mail.queue.MailQueueImpl.sendBuffer(MailQueueImpl.java:56) [atlassian-mail-2.7.18.jar:?]
at com.atlassian.jira.mail.JiraMailQueue$1.apply(JiraMailQueue.java:51) [classes/:?]
at com.atlassian.jira.mail.JiraMailQueue$1.apply(JiraMailQueue.java:48) [classes/:?]
at com.atlassian.jira.util.velocity.DefaultVelocityRequestContextFactory.runWithStaticBaseUrl(DefaultVelocityRequestContextFactory.java:110) [classes/:?]
at com.atlassian.jira.util.DefaultBaseUrl.runWithStaticBaseUrl(DefaultBaseUrl.java:50) [classes/:?]
at com.atlassian.jira.mail.JiraMailQueue.sendBuffer(JiraMailQueue.java:48) [classes/:?]
at com.atlassian.jira.service.services.mail.MailQueueService.run(MailQueueService.java:21) [classes/:?]
at com.atlassian.jira.service.JiraServiceContainerImpl.run(JiraServiceContainerImpl.java:61) [classes/:?]
at com.atlassian.jira.service.ServiceRunner.runService(ServiceRunner.java:62) [classes/:?]
at com.atlassian.jira.service.ServiceRunner.runServiceId(ServiceRunner.java:44) [classes/:?]
at com.atlassian.jira.service.ServiceRunner.runJob(ServiceRunner.java:32) [classes/:?]
at com.atlassian.scheduler.core.JobLauncher.runJob(JobLauncher.java:153) [atlassian-scheduler-core-1.7.0.jar:?]
at com.atlassian.scheduler.core.JobLauncher.launchAndBuildResponse(JobLauncher.java:118) [atlassian-scheduler-core-1.7.0.jar:?]
at com.atlassian.scheduler.core.JobLauncher.launch(JobLauncher.java:97) [atlassian-scheduler-core-1.7.0.jar:?]
at com.atlassian.scheduler.caesium.impl.CaesiumSchedulerService.launchJob(CaesiumSchedulerService.java:443) [atlassian-scheduler-caesium-1.3.3.jar:?]
at com.atlassian.scheduler.caesium.impl.CaesiumSchedulerService.executeLocalJob(CaesiumSchedulerService.java:410) [atlassian-scheduler-caesium-1.3.3.jar:?]
at com.atlassian.scheduler.caesium.impl.CaesiumSchedulerService.executeQueuedJob(CaesiumSchedulerService.java:388) [atlassian-scheduler-caesium-1.3.3.jar:?]
at com.atlassian.scheduler.caesium.impl.CaesiumSchedulerService$1.consume(CaesiumSchedulerService.java:285) [atlassian-scheduler-caesium-1.3.3.jar:?]
at com.atlassian.scheduler.caesium.impl.CaesiumSchedulerService$1.consume(CaesiumSchedulerService.java:282) [atlassian-scheduler-caesium-1.3.3.jar:?]
at com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.executeJob(SchedulerQueueWorker.java:65) [atlassian-scheduler-caesium-1.3.3.jar:?]
at com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.executeNextJob(SchedulerQueueWorker.java:59) [atlassian-scheduler-caesium-1.3.3.jar:?]
at com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.run(SchedulerQueueWorker.java:34) [atlassian-scheduler-caesium-1.3.3.jar:?]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_102]
Caused by: com.sun.mail.smtp.SMTPSendFailedException: 451 4.7.500 Server busy. Please try again later
Cause
The mail server is replying to Jira's attempts to deliver notifications with a temporary failure code, 451
Resolution
Follow up with your SMTP mail server provider to determine why the SMTP server is not accepting deliveries from JIRA
Updated on April 8, 2025
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