"SMTPSendFailedException: 550 5.0.0 Access denied" when JON tried to send email notifications

Solution Verified - Updated -

Issue

There are some exceptions about sending alerts via e-mail:

ERROR [org.rhq.enterprise.server.core.EmailManagerBean] Failed to send email [ [ALERT] priority of [!!! - High] for alert [Test Alert] on resource [jboss.example.com JBoss EAP 4.3.0.GA production (10.1.2.3)]] to recipient [recipient@example.com]
com.sun.mail.smtp.SMTPSendFailedException: 550 5.0.0 Access denied

Environment

  • JBoss Operation Network 2.3
  • Red Hat Enterprise Linux 5

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