Hi, is there a way to redirect log messages depending on a MDC variable to different appenders? The logback manual only uses MDC values for the pattern inside a single appender. Example: assume, the code sets a MDC variable "context". If a log message is supplied with context="A", it should be written to application_A.log, if it has context="B", the message should be written to application_B.log, and so on. If this is not possible by default, it should be possible to write a kind of MDCAwareAppenderWrapper like this (only pseudo code below): public class MDCAwareAppenderWrapper<E> implements Appender<E> { Map<String,Appender> appenderMap; String mdcName; ... setters and getters omitted public void doAppend(E event) { LoggingEvent le = (LoggingEvent)event; String mdcValue = le.getMDCPropertyMap().get(mdcName); Appender appender = appenderMap.get(mdcValue); appender.doAppend(event); } } MDCAwareAppenderWrapper is configured by a Map<String,Appender> that maps MDC values (A and B from the example above) to the real appenders. Any hints or comments on that? Kind regards, Stefan