Tellier Benoit created JAMES-2171:
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             Summary: LogMessage mailet improvments
                 Key: JAMES-2171
                 URL: https://issues.apache.org/jira/browse/JAMES-2171
             Project: James Server
          Issue Type: Improvement
          Components: Mailet Contributions
    Affects Versions: master
            Reporter: Tellier Benoit


Today, one can use the LogMessage to generate log messages upon mail reception

But the LogMessage have the following limits:

 - It do not let you configure the warn level
 - It does generate several logs. One would be simpler to review.
 - It does add some unneeded informations, like mail name already carried by 
the MDC
 - It does not allow logging of specific headers or specific attributeNames. 
This leads to missing information as well as "to much information".
 - The code quality of the mailet is poor.

You will:
 - Ensure a single log message will be generated. For this you will call the 
logger one time and concatenate log messages parts.
 - Remove the log line with mail name.
 - Add a **level** configuration option. It can takes value **warn**, **info**, 
**debug** or **error**. It will be used to set the logger log level.
 - Add a **specificHeaders** configuration option. It takes a comma separated 
list of header names to include in the log message. By default it is empty.
 - Add a **specificAttributes** configuration option.  It takes a comma 
separated list of attribute names to be included in the log message. By default 
it is empty.
 - **body** configuration option should be false by default
 - **header** configuration option should be false by default
 - **init** should propagate exception while initilizing (Integer parse 
exception, also passing a negative max body should throw.)
 - Remove inlined affectation for field. They can be unset on their declaration 
and set when init is called.

Correct *LogMessageTest* accordingly.

Don't hesitate to reach us on the *gitter* chat if you have any question.



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