Thx. Ceki, that works, but I have a question about how the filtering works: Java Main: public static void main(String[] args) { Marker notifyAdminMarker = MarkerFactory.getMarker("NOTIFY_ADMIN"); Logger logger = LoggerFactory.getLogger(LogBackTest.class); logger.debug("This is a regular debug message"); logger.debug(notifyAdminMarker, "Serious issue"); } } Logback.xml snippet: <appender name="EMAIL" class="ch.qos.logback.core.ConsoleAppender"> <filter class="ch.qos.logback.core.filter.EvaluatorFilter"> <evaluator> <expression>marker.contains("NOTIFY_ADMIN")</expression> </evaluator> <OnMatch>ACCEPT</OnMatch> <OnMismatch>DENY</OnMismatch> </filter> <encoder> <pattern>%d{HH:mm:ss.SSS} %-5level %logger{36} - %msg%n</pattern> </encoder> </appender> Running the above java and appender I get: 08:10:39.183 DEBUG aero.blue.logtest.LogBackTest - This is a regular debug message 08:10:39.190 DEBUG aero.blue.logtest.LogBackTest - Serious issue I expected to just get the Serious Issue line. Further, if I change the eval logic to Not match i.e.: <expression>!marker.contains("NOTIFY_ADMIN")</expression> I get: 08:16:47.035 DEBUG aero.blue.logtest.LogBackTest - This is a regular debug message Which is what I would expect, so is the inverse not working? ----- Buzzterrier http://buzzterrier.blogspot.com/ View my blog: Ordinary Average Developer... -- View this message in context: http://old.nabble.com/Evaluators-and-Markers----no-applicable-action-tp28609... Sent from the Logback User mailing list archive at Nabble.com.