Linux set up Postfix mail server
Chapter One: experimental environment and objectives
1. Experimental environment
两台局域网计算机，分别有Win7/10系统和Vm虚拟机安装CentOs7系统
CentOs7的IP地址：192.168.81.133;192.168.81.
Win7客户端(测试用),有Xshell或者SecureCRT工具
2. Objectives:
CentOs7下搭建Postfix邮件服务器，配置域名服务远程登录访问，新建用个测试用户(user1,user2)，两个用户用telnet命令登录邮件服务器，实现两个用户的邮件互发，并实现局域网内两个计算器的邮件互发
Chapter II: Content Experiments
1.准备工作
2.搭建DNS服务
3.搭建Postfix服务
4.远程登录访并实现两个用户邮件互发
5.局域网内两台计算机邮件互发
Chapter 3: Experimental Procedure
1. Preparation:
1.1 turn off the firewall and set the boot does not start from
systemctl stop firewalld
systemctl disable firewalld
1.2 Close selinux
setenforce 0
2. set up DNS service
2.1 install the DNS service
yum install bind -y
2.2 modify the configuration file named.conf
vim /etc/named.conf
2.3 modify named.rfc1912.zones file, add a forward zone
vim /etc/named.rfc1912.zones
2.4 Copy configuration template region
cp -p /var/named/named.localhost /var/named/duiyi.com.zone
2.5 modify the forward zone file
vim /var/named/duiyi.com.zone
2.6 Check grammar errors
named-checkconf
2.7 open DNS service, and set the boot from Kai
systemctl start named
systemctl enable named
2.8 Setting domain name server
vim /etc/resolv.conf
2.9 analytical verification
nslookup mail.duiyi.com
3. To build Postfix service
3.1 Check whether the system has been installed postfix server
rpm -q postfix
CentOs7 default postfix service there, and if not, by yum install postfix -y install it
3.2 to see if support cyrus, dovecot function
postconf -a
3.3 modify the main configuration file
vim /etc/postfix/main.cf
amend as below:
75行：myhostname = mail.duiyi.com //本机主机名
83行：mydomain = duiyi.com //服务器域名
99行：myorigin = $mydomain //初始域名
113行：inet_interfaces = 192.168.81.133,127.0.0.1 //监听接口
119行：inet_protocols = ipv4 //监听网络版本，可以不改
164行：mydestination = myhostname，mydomain //目标域
419 home_mailbox = Maildir/ //邮件目录，在用户家目录下
3.4 check whether the configuration file has a syntax error
postfix check
3.4 open Postfix service, and set the boot from Kai
systemctl start postfix
systemctl enable postfix
3.5 Create a test user sentmsg and recvmsg, and set password
useradd sentmsg
passwd sentmsg
useradd recvmsg
passwd recvmsg
3.6 Check whether the user has been created (Figure)
ls /home
4. Interview and implement remote login two users send each other e-mail
4.1 modify DNS Win7 / 10 to CentOs server address: 192.168.81.133
4.1 Enable Telnet on Win7 / 10, allowed as a client
控制面板->程序->程序和功能->启动或关闭Windows功能->Telnet客户端 勾选并确定
4.2 Open Xshell or SecureCRT and other remote tools (cmd window also, but the character encoding to be modified to utf-8), user login sentmsg in Xshell
telnet [email protected]
4.3 Xshell New tab, user login recvmsg
telnet [email protected]
4.4 sentmsg user sends a message to the user recvmsg
4.5 recvmsg view the message
