1.安装postfix(MTA)

Postfix handles the sending and receiving of mail

apt install postfix

重启:service postfix restart

2.安装 Dovecot(MDA)

Dovecot is what users, or rather their mail client of choice, connect to when they want to read the mail

apt install dovecot-imapd dovecot-pop3d

重启：service dovecot restart

3.安装squirrelmail

邮件服务器管理界面

wget https://sourceforge.net/projects/squirrelmail/files/stable/1.4.22/squirrelmail-webmail-1.4.22.zip
unzip squirrelmail-webmail-1.4.22.zip
mv squirrelmail-webmail-1.4.22 /var/www/html/
chown -R www-data:www-data /var/www/html/squirrelmail-webmail-1.4.22/
chmod 755 -R /var/www/html/squirrelmail-webmail-1.4.22/
mv /var/www/html/squirrelmail-webmail-1.4.22/ /var/www/html/squirrelmail

配置squirrelmamil

perl /var/www/html/squirrelmail/config/conf.pl
server settings——domain:wateryaml.cn
R——general options——allow server-side sorting:yes

切换到root用户：sudo -i
给root帐户设置密码

4.Creating Mail Users

useradd liqingwei
passwd ******

创建用户文件夹，并设置为默认目录
mkdir -p /var/www/html/liqingwei
usermod -m -d /var/www/html/liqingwei liqingwei

附予对该目录的权限：chown -R liqingwei:liqingwei /var/www/html/liqingwei

5.去登录

wateryaml.cn/squirrelmail

注：需要打开25端口，腾讯云要解封25端口。

相关网址

https://www.mail-tester.com

https://www.arclab.com/en/kb/email/list-of-smtp-and-pop3-servers-mailserver-list.html

让邮件能够进入收件箱

1.添加SPF(Sender Policy Framework)记录

主机记录：@：直接解释主域名
记录类型：TXT
记录值：v=spf1 a mx ip4:123.206.75.243 ~all

2.添加List-Unsubscribe header

Add header_checks = regexp:/etc/postfix/list_unsub_header to etc/postfix/main.cf

Create file (/etc/postfix/list_unsub_header) & append the following: /^Content-Transfer-Encoding:/i PREPEND List-Unsubscribe: YourTextGoesHere