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https://issues.apache.org/jira/browse/LOG4J2-1192?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thies Wellpott updated LOG4J2-1192:
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Attachment: (was: ExtendedSmtpAppender.java)
> Dynamic Subject for SMTP Appender
> ---------------------------------
>
> Key: LOG4J2-1192
> URL: https://issues.apache.org/jira/browse/LOG4J2-1192
> Project: Log4j 2
> Issue Type: New Feature
> Components: Appenders
> Affects Versions: 2.4.1
> Environment: ALL
> Reporter: Jörg Bretschneider
> Labels: features
> Attachments: ExtendedSmtpAppender.java, ExtendedSmtpManager.java,
> MaxLengthConverter.java
>
>
> It is annoying to have log messages sent to users via SMTP Appender with a
> static subject, requiring recipients to open each of possibly a vast amount
> of log emails in order to find out what went wrong.
> Users should be able to insert runtime diagnostic context information to the
> message text AND to the message subject as well.
> While the first seems to be working with Patternlayout using the mechanism
> with the %X{<key>} pattern based on a NDC or MDC <key> in the
> "ConversionPattern" parameter, it does NOT work with the "Subject" parameter
> with log4j (neither 1.2 nor 2.x), though some bloggers suggest it, e.g.
> http://stackoverflow.com/a/7015453.
> See
> http://stackoverflow.com/questions/29435825/log4j2-custom-email-subject-from-map
> as an example where others found this also.
> This issue should have been fixed long ago.
> I suggest to extend SMTP appender in order to be able to use %X and other
> Pattern conversion in the "Subject" parameter properly.
> http://openutils.sourceforge.net/openutils-log4j/smtpappender.html
> has already done the part for applying PatternLayout to the SMTP Appender
> "Subject". I didn't test if this works properly.
> Maybe this work can be included into log4j with minimal effort?
> This feature has originally been realized in LOGBACK using an MDC in
> Patternlayouts: http://logback.qos.ch/manual/mdc.html
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