'com.sun.mail.smtp.SMTPSendFailedException 553 5.5.4 Domain name required for sender address' when Configuring Mail Server

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Symptoms

Sending out a test email when Configuring a Server for Outgoing Mail fails. The username and password are correct. The following appears in the atlassian-confluence.log (or atlassian-confluence-outgoing-mail.log from 7.11):

com.atlassian.mail.MailException: com.sun.mail.smtp.SMTPSendFailedException: 553 5.5.4 <test-admin>... Domain name required for sender address test-admin
at com.atlassian.mail.server.impl.SMTPMailServerImpl.send(SMTPMailServerImpl.java:191) 

Cause

Some mail servers will automatically append the domain name to the user name when client try to login. However, some servers will not, hence fail the authentication.

Resolution

Append a domain name to the user name, for instance:

test-admin@mycompany.com






























Last modified on Jan 11, 2021

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