Java application cannot send a mail and output some java errors like Can't send command to SMTP host

Solution Verified - Updated -

Issue

  • A java application could not send a mail and output the java errors including javax.mail.MessagingException: Can't send command to SMTP host.
  • The local postfix process was suspected, but nothing was logged into /var/log/maillog for the connection error.

Environment

Red Hat Enterprise Linux 7.7

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