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https://issues.apache.org/jira/browse/LOG4J2-1450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15356507#comment-15356507
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Remko Popma commented on LOG4J2-1450:
-------------------------------------
Apart from the fact that the subject lookup may have an issue, it sounds like
the approach of using runtime lookups to dynamically change the SMTP Appender
settings is not a good approach because you may also want to change the
{{javax.mail.Session}} settings.
In that case, reloading the configuration is probably the way to go. One way
you could implement this is to have a "template" log4j2.xml configuration with
placeholders for the SMTP Appender settings. When the user uses the separate
app to configure the SMTP settings, use this template to generate the new
config text. You can then either overwrite the existing configuration file, or
use the [Log4j 2 JMX
interface|https://logging.apache.org/log4j/2.x/manual/jmx.html] to replace the
configuration text in memory.
> 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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