postfix+mysql接收邮件+空壳服务器

##########################################postfix+mysql

**）.使用客户端工具接收邮件
 yum install dovecot dovecot-mysql -y ##dovecot-mysql dovecot软件的插件，让此软件可以识别mysql

 vim /etc/dovecot/dovecot.conf
   24 protocols = imap pop3 lmtp  ##支持收件协议
   48 login_trusted_networks = 0.0.0.0/0 ##信任的网络
   49 disable_plaintext_auth = no  ##开启明文认证
 
 vim /etc/dovecot/conf.d/10-auth.conf
  123 !include auth-sql.conf.ext  ##开启mysql的认证方式

 cp /usr/share/doc/dovecot-2.2.10/example-config/dovecot-sql.conf.ext /etc/dovecot/dovecot-sql.conf.ext     ##mysql认证文件
 vim /etc/dovecot/dovecot-sql.conf.ext
  32 driver = mysql   ##数据库类型
  71 connect = host=localhost dbname=email user=postuser password=postuser ##查询时用到的数据库，用户，密码
  78 default_pass_scheme = PLAIN  ##默认认证方式为明文
  107 password_query = \   ##查询密码匹配的数据
  108   SELECT username, domain, password \
  109   FROM emailuser WHERE username = '%u' AND domain = '%d'
  125 user_query = SELECT mailbox, 666 AS uid, 666 AS gid FROM emailuser WHERE username = '%u' ##查询邮件内容
 
 vim /etc/dovecot/conf.d/10-mail.conf
  30 mail_location = maildir:/home/vmail/%d/%n ##指定邮件的位置  
  168 first_valid_uid = 666   ##邮件文件查询用户身份
  175 first_valid_gid = 666
 
 systemctl restart dovecot
 测试：
 yum install telnet -y
 [[email protected] vmail]# telnet 172.25.254.123 110
 Trying 172.25.254.123...
 Connected to 172.25.254.123.
 Escape character is '^]'.
 +OK [XCLIENT] Dovecot ready.
 user [email protected]
 +OK
 pass lala
 +OK Logged in.

 
 可以用雷鸟软件收发邮件
 

**）.空壳服务器
 desktop：mail.westos.com
 server：nullmail.example.com
 
 vim /etc/postfix/main.cf
  75 myhostname = nullmail.example.com
  83 mydomain = example.com
  99 myorigin = westos.com  ##和desktop端的域名必须一致
  113 inet_interfaces = all
  164 mydestination =
  316 relayhost = 172.25.254.123
 systemctl restart postfix
 测试：
 server端给自己发送邮件，desktop会收到