Ideally rather than just using the logging level, you could use a pluggable trigger. Then you could implement what is requested in this thread: http://logback.10977.n7.nabble.com/Is-grouped-deferred-log-statements-from-same-threads-possible-using-logback-td11522.html

You'd just use an MDC value to trigger the end of batch.

Ideally the code from SMTP appender could be shared? Not sure how feasible that is.

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