Unable to Send Email Due to 'javax.mail.AuthenticationFailedException' Error Message

Platform Notice: Cloud and Data Center - This article applies equally to both cloud and data center platforms.

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

Symptoms

Unable to send test email successfully. The error appears:

AuthenticationFailedException


              
               
                An error has occurred with sending the test email:
               
               
                com.atlassian.mail.MailException: javax.mail.AuthenticationFailedException
                
                 at com.atlassian.mail.server.impl.SMTPMailServerImpl.send(SMTPMailServerImpl.java:191)
                 
                  at com.atlassian.confluence.admin.actions.mail.SendTestEmailAction.execute(SendTestEmailAction.java:52)

535 5.7.3 Authentication Unsuccessful


              
               
                Caused by: com.atlassian.crowd.event.EventJobExecutionException: Could not send email to [email protected]: 535 5.7.3 Authentication unsuccessful