Before building Exim, we need to create the group and user exim which will run the exim daemon: groupadd exim && useradd -d /dev/null -g exim -s /bin/false exim Install Exim with the following commands: sed -e 's/^BIN_DIR.*$/BIN_DIRECTORY=\/usr\/sbin/' src/EDITME | \ sed -e 's/^CONF.*$/CONFIGURE_FILE=\/etc\/exim.conf/' | \ sed -e 's/^EXIM_USER.*$/EXIM_USER=exim/' | \ sed -e 's/^EXIM_MONITOR/#EXIM_MONITOR/' > Local/Makefile && make && make install && cp doc/exim.8 /usr/share/man/man8 && ln -s exim-4.24-1 /usr/sbin/exim && ln -s exim /usr/sbin/sendmail