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