repo fedora

echo [fedora_repo] >> /etc/yum.repos.d/fedora_repo.repo #allow yum access to the fedora repo

echo name=fedora_repo >> /etc/yum.repos.d/fedora_repo.repo

echo baseurl=http://download1.fedora.redhat.com/pub/epel/\$releasever/\$basearch/ >> /etc/yum.repos.d/fedora_repo.repo

echo enabled=1 >> /etc/yum.repos.d/fedora_repo.repo

echo skip_if_unavailable=1 >> /etc/yum.repos.d/fedora_repo.repo

echo gpgcheck=0 >> /etc/yum.repos.d/fedora_repo.repo

yum -y install ssmtp

sed 's/^enabled=1/enabled=0/' -i /etc/yum.repos.d/fedora_repo.repo #disable fedora repo

sumber : https://mbrownnyc.wordpress.com/2012/04/12/using-ssmtp-on-centos-6/