The postcont -n command for Postfix shows you changes made to the default configuration.  Here is a listing of the new Ubuntu 9.10 and the output for Postfix.  As you can see nothing too significant except you see a focus on TLS for secure communication which is great, however this really needs to be addressed for users from the client ...

Using Pre-Built Templates Add the pre-built templates for Postfix. sudo apt-get install apparmor-profiles This will load many pre-built templates that you can use. cd /usr/share/doc/apparmor-profiles/extras Now copy all of the Postfix related profiles into /etc/apparmor.d/. sudo cp usr.sbin.post* /etc/apparmor.d/ sudo cp ...