Hi, First, thanks a lot for reporting.
> Exception in thread "main" java.lang.NoClassDefFoundError: > org/apache/log4j/Logger [...] > I already tried to solve the problem by installing liblog4j2-java but > got the same error. Nailed it : $ davmail /etc/davmail.properties Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/log4j/Logger at davmail.DavGateway.<clinit>(DavGateway.java:45) Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Logger at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 1 more $ sudo apt install liblog4j1.2-java $ davmail /etc/davmail.properties We missed this because libmail-java brings in log4j in the classpath but not the jar. Alex