Before building exim, we need to create a user and group for exim with the following commands: groupadd exim useradd -g exim 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 && ln -s /usr/sbin/exim /usr/sbin/sendmail