Hello, When using the SMTPAppender as such: <appender name="EMAIL" class="ch.qos.logback.classic.net.SMTPAppender"> <smtpHost>1.1.1.1</smtpHost> <to>blah@blah</to> <from>blah@blah</from> <subject>TESTING: %logger{36} - %m</subject> <layout class="ch.qos.logback.classic.PatternLayout"> <pattern>%d{yyyyMMddHHmm:ss} %level [%thread] %logger{36} [%file:%line] %msg%n</pattern> </layout> </appender> The resulting log prints out like so: 201208161255:43 DEBUG [main] LoggingStuff.Foo [?:?] Did it again! 201208161255:43 INFO [main] LoggingStuff.Foo [?:?] Ha info - do it 201208161255:43 WARN [main] LoggingStuff.Foo [?:?] Something is about to happen! 201208161255:43 ERROR [main] LoggingStuff.Foo [?:?] Serious stuff - is it? java.lang.Exception: Yep at LoggingStuff.Foo.doIt(Foo.java:56) [classes/:na] at LoggingStuff.MyApp1.main(MyApp1.java:39) [classes/:na] Where the %file and %line parameters are not set and show up as a '?'. Using the ConsoleAppender and the FileAppender with the same pattern the parameters all get set correctly, as such: 201208161247:54 DEBUG [main] LoggingStuff.Foo [Foo.java:53] Did it again! 201208161247:54 INFO [main] LoggingStuff.Foo [Foo.java:54] Ha info - do it 201208161247:54 WARN [main] LoggingStuff.Foo [Foo.java:55] Something is about to happen! 201208161247:54 ERROR [main] LoggingStuff.Foo [Foo.java:56] Serious stuff - is it? java.lang.Exception: Yep at LoggingStuff.Foo.doIt(Foo.java:56) [classes/:na] at LoggingStuff.MyApp1.main(MyApp1.java:39) [classes/:na] The one thing I have noticed, when looking at the sample code, is that for both the File and Console appenders, the <pattern> tag is wrapped by an <encoder> tag. Where as with the SMTP appender, the <pattern> tag is wrapped by a <layout> tag. Is there a way of forcing the SMTP appender to set these parameters? Thank you Patrick