IMAppender() The default constructor will instantiate the appender with a
default TriggeringEventEvaluator that will trigger on events
with level ERROR or higher.
setEvaluatorClass(String value) The EvaluatorClass option takes a string value
representing the name of the class implementing the
TriggeringEventEvaluator interface.
This method called by
AppenderSkeleton.doAppend method
does most of the real appending work. Adds the event to a buffer
and checks if the event triggers a message to be sent.
The EvaluatorClass option takes a string value
representing the name of the class implementing the
TriggeringEventEvaluator interface. A corresponding object will
be instantiated and assigned as the triggering event evaluator
for the SMTPAppender.