# dnf install gcc*# dnf install tar# dnf install wget# dnf install postfix
# dnf install cyrus-sasl cyrus-sasl-plain
# systemctl start postfix.service
# systemctl enable postfix.service# dnf install s-nail# dnf install bind-utils# dnf install openssl-devel# dnf install rsync# dnf install tree# dnf --enablerepo=epel install ncdu