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https://issues.apache.org/jira/browse/LOG4J2-1450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15355096#comment-15355096
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Remko Popma commented on LOG4J2-1450:
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Took a quick look at the code. Looks like {{subject}} already supports $$
runtime lookups (Benjamin, could you verify this?).
The following attributes are used for each email that is sent, and it should be
possible to support runtime lookups for these attributes:
* from
* replyto
* to
* cc
* bcc
* subject (already a runtime lookup)
However, the current SMTPManagerFactory implementation creates a
{{javax.mail.Session}} when the configuration is parsed and the appender is
initialized. This makes sense from a performance perspective since creating a
Session is too expensive to do for each log event. Since the Session is created
only once, these attributes are read only once at initialization time...
* protocol
* host
* port
* username
* password
Benjamin, can you give us some more background on whether your use case
requires runtime lookups for the {{javax.mail.Session}} -related attributes?
> SMTPAppender support for runtime lookup
> ---------------------------------------
>
> Key: LOG4J2-1450
> URL: https://issues.apache.org/jira/browse/LOG4J2-1450
> Project: Log4j 2
> Issue Type: Improvement
> Reporter: Benjamin Jaton
>
> http://logging.apache.org/log4j/2.x/manual/configuration.html#RuntimeLookup
> "Not all elements support resolving variables at runtime."
> The SMTPAppender doesn't support using:
> {noformat}{
> "type" : "smtp",
> "name" : "EmailAppender",
> "subject" : "$${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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