空殼端：
vim /etc/named.rfc1912.zones
cd /var/named/
cp -p westos.com.zone westos.org.zone
vim westos.orf.zone
rm -fr /etc/postfix/main.cf
yum reinstall postfix -y
systemctl restart postfix.service
vim /etc/postfix/main.cf
systemctl restart postfix.service
主機端：
systemctl start mariadb
systemctl start httpd
systemctl stop firewalld
cd /home/vmail/
rm -fr westos.org/
vim /etc/postfix/main.cf
systemctl restart postfix.service
測試：
空殼端：
mail [email protected]
主機端：
watch -n 1 ls
