yum install postfix
yum install system-switch-mail //mail転送ソフトの変更コマンド
system-switch-mail
/etc/postfix/main.cf を編集
myhostname = inf.～.com
mydomain = ～.com
myorigin = $myhostname
inet_interfaces = all
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
mynetworks = 192.168.0.0/16, 127.0.0.0/8
sendmail_path = /usr/sbin/sendmail
chkconfig postfix on 自動起動
