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https://issues.apache.org/jira/browse/LOG4J2-1450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15356526#comment-15356526
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Ralph Goers commented on LOG4J2-1450:
-------------------------------------
I can't really imagine why you would want to change the parameters to connect
to the SMTP server, but one possible way to do this would be to use a
RoutingAppender - it will dynamically create Appenders as needed.
> SMTPAppender support for runtime lookup
> ---------------------------------------
>
> Key: LOG4J2-1450
> URL: https://issues.apache.org/jira/browse/LOG4J2-1450
> Project: Log4j 2
> Issue Type: Improvement
> Reporter: Benjamin Jaton
>
> http://logging.apache.org/log4j/2.x/manual/configuration.html#RuntimeLookup
> "Not all elements support resolving variables at runtime."
> The SMTPAppender doesn't support using:
> {noformat}{
> "type" : "smtp",
> "name" : "EmailAppender",
> "subject" : "$${email.subject}",
> "to" : "$${email.recipient}",
> "from" : "$${email.from}",
> "smtpProtocol" : "$${email.smtp.protocol}",
> "smtpHost" : "$${email.smtp.host}",
> "smtpPort" : "$${email.smtp.port}",
> "smtpUsername" : "$${email.smtp.username}",
> "smtpPassword" : "$${email.smtp.password}"
> }{noformat}
> However that would be very useful so that the user doesn't have to reload the
> whole log4j2 configuration when the SMTP parameters have changed.
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