504 Error Setting up SMTP Server
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
An error occurs when sending a test email:
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com.atlassian.mail.MailException: javax.mail.MessagingException: 504 Command parameter not implemented
at com.atlassian.mail.server.impl.SMTPMailServerImpl.send(SMTPMailServerImpl.java:191)
at com.atlassian.confluence.admin.actions.mail.SendTestEmailAction.execute(SendTestEmailAction.java:52)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:168)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:35)
Cause
The host name is not set to the FQDN (Fully Qualified Domain Name).
Resolution
Use the "hostname" command to set the host to the FQDN (Fully Qualified Domain Name).
Change:
1 2% hostname myhostTo:
1 2% hostname myhost.mydomain.com
Updated on April 8, 2025
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