Debian10.2配置邮件服务器postfix+dovecot

解决中小局域网内邮件服务的问题，使用postfix与dovecot搭建SMTP和POP3服务器。

安装服务器组件

apt-get install –y postfix dovecot-pop3d mailutils

其中mailutils，是mail命令程序。如果不用命令行方式的话，可以不安装。

安装postfix的时候，会提示要求选择邮件服务器类型，这里选择Internet Site。

No configuration:
    Should be chosen to leave the current configuration unchanged.
Internet site:
    Mail is sent and received directly using SMTP.
Internet with smarthost:
    Mail is received directly using SMTP or by running a utility such as fetchmail. Outgoing mail is sent using a smarthost.
Satellite system:
    All mail is sent to another machine, called a 'smarthost', for delivery.
Local only:
    The only delivered mail is the mail for local users. There is no network.

进而会提示输入邮件域名，这里按需填写。（例如mail.wa.cn）

配置环境

邮件服务器IP地址=192.168.31.73，测试用户名为test（密码123）、duanjsh（密码123）。测试PC机一台，与邮件服务器三层可达。

修改/etc/hosts，把相应域名加入到hosts中。