First, the theoretical part
E-mail system based on e-mail messages to complete the transfer protocol
commonly used protocols are:
Simple Mail Transfer Protocol (SMTP): e-mail for sending and transit issued occupancy server TCP / 25 port
Post Office Protocol version 3 (POP3): the email storage to the local host, occupied for a TCP server / port 110
internet message access protocol version 4 (IMAP4): TCP messages for local host access, the server occupied / 143 terminal
ports
In the e-mail system
to send and receive mail server user called mail user agent (MUA) -> Client program
to save the user's mailbox the mail server (MDA) -> Save Mail
forwarding messages between different e-mail service provider, the MUA messages from the MTA to the appropriate forwarding service
device (MTA) -> client service procedures
When you deploy enterprise-class e-mail system, there are four considerations Please note
add anti-spam and anti-virus module: it can effectively prevent spam or virus messages interference with business mail
mail encryption: message contents can not be effectively protected hackers steal and tampering
add mail monitoring audit module: can effectively monitor whether there is a sensitive word to all employees of companies in the mail, if there is to disclose corporate
irregularities such as data
protection stability: stability is critical email systems, operation and maintenance should be done to ensure the stable operation of the e-mail system,
and to be ready in time to prevent distributed denial of service attack
postfix master configuration file located /etc/postfix/main.cf
important parameters
| parameter | effect |
|---|---|
| myhostname | Host name of the post office system |
| mydomain | Domain name system of the post office |
| myorigin | Mail sent from the local domain name system |
| inet_interfaces | Listening network interface |
| mydestination | Host or domain name can receive mail |
| mynetworks | Set which hosts can be forwarded messages |
| relay_domains | Set which messages can be forwarded domain |
Second, the deployment process
| operating system | ip address | service name |
|---|---|---|
| centos7_1 | 192.168.81.210 | postfix+bind |
| centos7_2 | 192.168.81.220 | dovecot |
| win7_1 | 192.168.81.134 | outlook |
DNS service configuration (Once configured to write on each server dns address)
1. Configure the server host name, host name of the server you need to ensure consistency with the transmission domain
[root@mail ~]# vim /etc/hostname
mail.longzi.com
[root@mail ~]# hostnamectl set-hostname mail.longzi.com
2. Install the bind service (DNS)
[root@mail ~]#yum -y install bind bind-chroot
3. Configure the bind service
[root@mail ~]#vim /etc/named.conf
修改
listen-on port 53 { any; }；
allow-query { any; };
4. Analytical configures the forward region
[root@mail ~]#vim /etc/named.rfc1912.zones
The configuration data file area
[root@mail ~]# vim /var/named/longzi.com.zone
6. Restart the service can bind
Postfix server configuration
1. Install postfix
[root@mail ~]# yum -y install postfix
2. modify the configuration file
[root@mail ~]# vim /etc/postfix/main.cf
修改76：myhostname=mail.longzi.com //定义主机名
修改83：mydomain = longzi.com //定义域名
修改99：myorigin = $mydomain //从本机发出邮件的域名名称
修改116：inet_interfaces = all //监听的网卡接口
修改164：mydestination = $myhostname , $mydomain //设置可转发哪 些主机的邮件
3. Restart services to
4. Create a mailbox user, useradd passwd
Dovecot server configuration
1. Setup
[root@localhost ~]# yum -y install dovecot
2. Modify the main configuration file
[root@localhost ~]# vim /etc/dovecor/dovecot.conf
修改24：protocols = imap pop3 imtp //支持的电子邮件协议
修改25：disable_plaintext_auth = no //是否允许明文验证
修改48：login_trusted_networks = 192.168.81.0/24 //哪些人可以使 用
3. Configure the message format and storage path
[root@localhost ~]#vim /etc/dovecot/conf.d/10-mail.conf
修改24：mail_location = mbox:~/mail:INBOX=/var/mail/%u
4. Restart the service to
verification
win7 use outlook mail
