/etc/inetd.conf and /etc/syslogd.conf If you use inetd, the following command will add the qpopper entry to /etc/inetd.conf: echo "pop stream tcp nowait root /usr/sbin/popper popper" >> \ /etc/inetd.conf && echo "pop 110/tcp" >> /etc/services && killall inetd || inetd && echo "local0.notice;local0.debug /var/log/POP.log" >> \ /etc/syslog.conf && killall -HUP syslogd Issue a killall -HUP inetd to reread the changed inetd.conf file. If you use xinetd, the following command will add the qpopper entry to /etc/xinetd.conf: cat >> /etc/xinetd.conf << "EOF" service pop { port = 110 socket_type = stream protocol = tcp wait = no user = root passenv = PATH server = /usr/sbin/popper server_args = popper } EOF Issue a killall -HUP xinetd to reread the changed xinetd.conf file.