Dear All, Many thanks for your advices. Mike don't worry. I am not touching anything unless I know exactly what am I doing !!!! (in any case, thank you because you spare some time to think of MY problem) I have set-up all user accounts (in the mailer) using the command: useradd -s /bin/false -d /dev/null -m username so users do not have shell access to the server. So yes John, all my users point to /dev/null as a home directory. However, I don't want my users to have shell access (for security reasons) Is any other way creating users with no shell access ? Or it is safer (from security point of view) to use: DontBlameSendmail=forwardfileinunsafedirpath,forwardfileinunsafedirpaths afe as Scott mentioned ?? Best Regards Christos
