1.环境准备
两台机子 一台作为dns服务器

配置好dns服务端

[[email protected] ~]# yum install bind -y
[[email protected] ~]# systemctl stop firewalld
[[email protected] ~]# vim /etc/named.conf
// listen-on port 53 { 127.0.0.1; };
// listen-on-v6 port 53 { ::1; };
// allow-query { localhost; };
dnssec-validation no; ##不启用DNSSEC验证
[[email protected] ~]# vim /etc/named.rfc1912.zones
zone “westos.com” IN {
type master;
file “westos.com.zone”;
allow-update { none; };
};
zone “qq.com” IN {
type master;
file “qq.com.zone”;
allow-update { none; };
};
[[email protected] ~]# cp -p /var/named/named.localhost /var/named/westos.com.zone
[[email protected] ~]# cp -p /var/named/westos.com.zone /var/named/qq.com.zone
[[email protected] ~]# vim /var/named/westos.com.zone
TTL 1D  
@       IN SOA  westos.com. root.westos.com. (  
                                        0       ; serial  
                                        1D      ; refresh  
                                        1H      ; retry  
                                        1W      ; expire  
                                        3H )    ; minimum  
                NS      dns.westos.com.  
dns             A       172.25.254.119  
westos.com.     MX 1    172.25.254.119.  
[[email protected] ~]# vim /var/named/qq.com.zoneTTL 1D
@ IN SOA qq.com. root.qq.com. (
0 ; serial
1D ; refresh
1H ; retry
1W ; expire
3H ) ; minimum
NS dns.qq.com.
dns A 172.25.254.119
qq.com. MX 1 172.25.254.219.
[[email protected] ~]# vim /etc/resolv.conf
nameserver 172.25.254.119
[[email protected] ~]# systemctl restart named.server

配置好另一台

[[email protected] ~]# vim /etc/resolv.conf
nameserver 172.25.254.119

2.postfix

基本信息

postfix提供smtp协议用来投递邮件
默认端口25
默认情况下邮件端口只在127.0.0.1上开启
/var/log/maillog ##服务日志
[[email protected] ~]# mail [email protected] ##发送邮件给[email protected]
Subject: hello ##邮件标题
hello world ##邮件正文
. ##用 . 来结束录入内容并发送
[[email protected] ~]# mailq ##查看邮件队列
[[email protected] ~]# postqueue -f ##重新处理邮件队列

配置

[[email protected] ~]# vim /etc/postfix/main.cf ##配置文件
76 myhostname = qq-mail.qq.com ##指定mta主机名称
83 mydomain = qq.com ##指定mta域名
99 myorigin = mydomain                ##指定邮件来源结尾（@后面的字符内容）  
116 inet_interfaces = all           ##25端口在所有网络接口开启  
164 mydestination =myhostname, $mydomain, localhost##接受指定字符结尾的邮件
[[email protected] ~]# systemctl restart postfix.service

[[email protected] ~]# vim /etc/postfix/main.cf
76 myhostname = qq-westos.qq.com
83 mydomain = westos.com
99 myorigin = mydomain116inetinterfaces=all164mydestination=myhostname, $mydomain, localhost
[[email protected] ~]# systemctl restart postfix.service

3.邮件别名与群发
接收端
[[email protected] ~]# vim /etc/aliases ##配置
admin: root ##别名： 真名 #邮件别名
moreuser: :include:/etc/postfix/userlist ##别名： :include:file #邮件群发
[[email protected] ~]# vim /etc/postfix/userlist ##群发用户列表
student
root
[[email protected] ~]# postalias /etc/aliases ##重新查询别名数据文件

发送端
[[email protected] ~]# mail 别名