To build and install nullmailer, run: sh autogen.sh ./configure make sudo make install install-root (Running autogen.sh is optional for release packages) To enable SSL/TLS support, add "--enable-tls" to the configure command line above. The default installation expects that a user and group "nullmail" have already been set up. The install steps will create all appropriate configuration and queue directories, and change their ownership as needed. You may set the installation directory and other parameters by options to ./configure. To see them, run: ./configure --help