配置DNS
mailwestos.example.com
vim /etc/named.rfc1912.zones
zone "westos.com" IN {
type master;
file "westos.com.zone";
allow-update { none; };
};
zone "linux.com" IN {
type master;
file "linux.com.zone";
allow-update { none; };
};
cp -p named.localhost westos.com.zone
vim /var/named/westos.com.zone
cp -p westos.com.zone linux.com.zone
vim /var/named/linux.com.zone
systemctl restart named
systemctl stop firewalld
vim /etc/postfix/main.cf
maillinux.example.com
●別名發送:
linux.com 主機向 westos.com主機發送郵件，使用別名發送
vim /etc/aliases
vim /etc/moreusers
root
student
postalias /etc/aliases
systemctl restart postfix.service
4.出站地址僞裝
server (westos.com)主機:
vim /etc/postfix/generic
postmap /etc/postfix/generic
postconf -d | grep generic 會出來一段字符,選擇最後的一行字符(如下)，進行復制:
smtp_generic_maps =
postconf -e "smtp_generic_maps = hash:/etc/postfix/generic" ##此處用到上條語句複製的字符
systemctl restart postfix.servic
5.檢測25端口
下載 yum install telnet -y
250 2.0.0 Ok: queued as 38E0C17E849
quit ##退出telnet
221 2.0.0 Bye
Connection closed by foreign host.