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https://issues.apache.org/jira/browse/LOG4J2-1192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15177451#comment-15177451
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Thies Wellpott commented on LOG4J2-1192:
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Gary: Your changes look good.
In the change log you should emphasize the fact, that in special cases
compatibility is broken because the previously fixed string is now always
parsed as PatternLayout. Behaviour is different for subject texts with the
PatternLayout special chars ("%" etc.). In my opinion no problem because the
fix for users is very easy (replace "%" in subject with "%%") and having a
pattern in subject is a great advantage.
Additional note:
My provided solution (ExtendedSmtpAppender) contains more features (the burst
filter), for which I created a different issue (LOG4J2-1210). Using a
PatternLayout for subject is optional in my implementation (parameter
subjectWithLayout="true").
> 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
> Assignee: Gary Gregory
> Labels: features
> Fix For: 2.6
>
> 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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