mailconf tries to run /usr/bin/makemap /etc/mail/deny < /etc/mail/deny The correct invocation is /usr/bin/makemap hash /etc/mail/deny < /etc/mail/deny Also, the following line is missing from /usr/lib/linuxconf/redhat/linuxconf.daemons (or some other equivilent file) makemap /usr/bin/makemap
Red Hat does not support the mailconf module.