最近分配到一台ECS服务器，需要搭建一台邮件服务器。

查了一波资料选择了Postfix (smtp)和 Dovecot（pop3）.

推荐教程： (我的是CentOS6.5 如果是Centos7.*的注意selinux，防止出现坑,ubuntu用此教程的话注意使用sudo指令，其他基本相同)

1：配置 DNS 服务器并添加邮件服务器 MX 记录. 并让 ISP 支持你的静态 IP 与域名. (局域网搭建跳过此步骤，服务器必须)

2：安装 Postfix

[root@server ~]# yum install postfix -y

配置 Postfix

打开 /etc/postfix/main.cf 更改如下配置:

## Line no 75 - Uncomment and set your mail server FQDN ##myhostname = server.cnblogs.com 你的主机名称（比我是mail.xxx.com,需要加到MX记录，优先级10）## Line 83 - Uncomment and Set domain name ##mydomain = cnblogs.com 你的域名(比如我是xxx.com)## Line 99 - Uncomment ##myorigin = $mydomain## Line 116 - Set ipv4 ##inet_interfaces = all## Line 119 - Change to all ##inet_protocols = all## Line 164 - Comment ###mydestination = $myhostname, localhost.$mydomain, localhost,## Line 165 - Uncomment ##mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain## Line 264 - Uncomment and add IP range ##mynetworks = 192.168.1.0/24, 127.0.0.0/8（也可以不改）## Line 419 - Uncomment ##home_mailbox = Maildir/ （邮件存放目录）

保存并退出, 重启 Postfix 服务:

[root@server ~]# /etc/init.d/postfix start[root@server ~]# /etc/init.d/postfix statusmaster (pid  1290) is running...[root@server ~]# chkconfig postfix on

测试 Postfix

通过 telnet 进行测试, 没有 telnet 可通过 yum 安装, 一下出现红色字体表示输入.

新建测试用户 fourone:

[root@server ~]# useradd fourone[root@server ~]# passwd fourone

测试功能

[root@server ~]# telnet localhost smtpTrying ::1...Connected to localhost.Escape character is '^]'.220 server.cnblogs.com ESMTP Postfixehlo localhost250-server.cnblogs.com250-PIPELINING250-SIZE 10240000250-VRFY250-ETRN250-ENHANCEDSTATUSCODES250-8BITMIME250 DSNmail from:
     
      250 2.1.0 Okrcpt to:
      
       250 2.1.5 Okdata354 End data with 
       
        
         .
         
          
           hello fourone.250 2.0.0 Ok: queued as 3E68E284Cquit221 2.0.0 ByeConnection closed by foreign host.
          
         
        
       
      
     

进入 fourone mail 目录检查邮件:

[root@server ~]# ls /home/fourone/Maildir/new/1369816264.Vfd00I41ec0M251771.server.cnblogs.com[root@server ~]# cat /home/fourone/Maildir/new/1369816264.Vfd00I41ec0M251771.server.cnblogs.com Return-Path: 
     
      X-Original-To: fouroneDelivered-To: fourone@cnblogs.comReceived: from localhost (localhost [IPv6:::1])    by server.cnblogs.com (Postfix) with ESMTP id 3E68E284C    for 
      
       ; Wed, 29 May 2013 14:00:36 +0530 (IST)Message-Id: <20130529083047.3E68E284C@server.cnblogs.com>Date: Wed, 29 May 2013 14:00:36 +0530 (IST)From: fourone@cnblogs.comTo: undisclosed-recipients:;
      
     

hello fourone

3：安装 Dovecot

Dovecote 是一款开源 IMAP/POP3 邮件服务器 for Unix/Linux systems.

[root@server ~]# yum install dovecot

配置 Dovecot

打开 /etc/dovecot/dovecot.conf 更改如下配置:

## Line 20 - umcomment ##protocols = imap pop3 lmtp

打开 /etc/dovecot/conf.d/10-mail.conf:

## Line 24 - uncomment ##mail_location = maildir:~/Maildir （遇上面postfix一致）

打开 /etc/dovecot/conf.d/10-auth.conf:

## line 9 - uncomment##disable_plaintext_auth = yes （出现如果不要ssl验证的则是no）## Line 99- Add a letter "login" ##auth_mechanisms = plain login

打开 /etc/dovecot/conf.d/10-master.conf:

## Line 83, 84 - Uncomment and add "postfix"   #mode = 0600   user = postfix   group = postfix

开启 Dovecot 服务:

[root@server ~]# service dovecot startStarting Dovecot Imap:                                     [  OK  ][root@server ~]# chkconfig dovecot on （加入系统启动项）

测试 Dovecot

[root@server ~]# telnet localhost pop3Trying ::1...Connected to localhost.Escape character is '^]'.+OK Dovecot ready.user fourone+OKpass 111111      ## Here 111111 is password of user "fourone" ##+OK Logged in.list+OK 1 messages:1 427.retr 1+OK 427 octetsReturn-Path: 
     
      X-Original-To: fouroneDelivered-To: fourone@cnblogs.comReceived: from localhost (localhost [IPv6:::1])    by server.cnblogs.com (Postfix) with ESMTP id 3E68E284C    for 
      
       ; Wed, 29 May 2013 14:00:36 +0530 (IST)Message-Id: <20130529083047.3E68E284C@server.cnblogs.com>Date: Wed, 29 May 2013 14:00:36 +0530 (IST)From: fourone@cnblogs.comTo: undisclosed-recipients:;hello fourone.quit+OK Logging out.Connection closed by foreign host.
      
     

Dovecot 测试成功.