1 前言
一个问题，一篇文章，一出故事。
笔者需要将邮件“will@mail03.cmdschool.org”自动转发到“will@mail01.cmdschool.org”，于是想到使用虚拟邮件映射功能。
2 最佳实践
2.1 配置mail01主机
请参阅以下文档配置标准邮件投递主机mail01（需要其他功能也可以配置），请注意可以不配置mail02，
2.2 配置mail03主机
2.2.1 配置主机名称
hostnamectl set-hostname mail03.cmdschool.org
2.2.2 确保chronycd启动并正确配置
systemctl status chronyd.service
grep ^pool /etc/chrony.conf
最后一条命令显示如下，
pool 2.rhel.pool.ntp.org iburst
注：如果内网有NTP服务器，可将以上NTP服务器的域名换成内网的NTP服务器（需要重启服务配置生效才生效）
2.2.3 安装常用软件包
In mail03
yum install -y vim
2.2.4 安装软件包
In mail03
yum install -y sendmail sendmail-cf m4
2.2.5 启动与设置自启动并获取状态
In mail03
systemctl start sendmail.service systemctl enable sendmail.service systemctl status sendmail.service systemctl start saslauthd.service systemctl enable saslauthd.service systemctl status saslauthd.service
服务启动后，建议你使用如下命令查看端口倾听状态，
netstat -antp | grep "sendmail"
可见如下显示，
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 30320/sendmail: acc
2.2.6 修改服务器配置
In mail03
cp /etc/mail/sendmail.mc /etc/mail/sendmail.mc.default vim /etc/mail/sendmail.mc
修改如下配置使倾听端口允许对外服务，
DAEMON_OPTIONS(`Port=smtp,Addr=0.0.0.0, Name=MTA')dnl
如果需要使配置生效，还需执行如下操作，
m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
以上配置完成后，我们使用如下命令配置虚拟邮件映射，
cp /etc/mail/virtusertable /etc/mail/virtusertable.default vim /etc/mail/virtusertable
修改如下配置使倾听端口允许对外服务，
will@mail03.cmdschool.org will@mail01.cmdschool.org
配置文件修改完毕后，还需运行如下命令更新配置，
makemap hash /etc/mail/virtusertable.db < /etc/mail/virtusertable
2.2.7 重启服务使配置生效
In mail03
systemctl restart sendmail.service
服务重启后倾听端口地址有所变化，
netstat -antp | grep "sendmail"
可见如下显示，
tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 3978/sendmail: acce
2.3 测试Sendmail
2.3.1 安装软件包
In mail03,
yum install -y mailx
2.3.2 本地命令测试邮件发送
In mail03,
echo 'it is only a test' | mail -s "test eamil" will@mail03.cmdschool.org
2.3.3 使用命令行阅读邮件
In mail01,
su - will
以上命令切换用户身份，然后使用如下命令查看邮件，
mailx
操作向导如下，
Heirloom Mail version 12.5 7/5/10. Type ? for help. "/var/spool/mail/will": 1 message 1 new >N 1 root Tue Jul 27 04:47 25/1129 "test eamil" & type 1 Message 1: From root@mail03.cmdschool.org Tue Jul 27 04:47:04 2021 Return-Path: From: root Date: Tue, 27 Jul 2021 04:47:04 -0400 To: will@mail03.cmdschool.org Subject: test eamil User-Agent: Heirloom mailx 12.5 7/5/10 Content-Type: text/plain; charset=us-ascii Status: R it is only a test & delete 1 & quit
参阅文档
=================
Sendmail官方主页
————
https://www.proofpoint.com/us/products/email-protection/open-source-email-solution
Sendmail使用文档
——————–
http://mirror.internode.on.net/pub/ldp/en/solrhe/chap22sec176.html
http://etutorials.org/Linux+systems/red+hat+linux+bible+fedora+enterprise+edition/Part+IV+Red+Hat+Linux+Network+and+Server+Setup/Chapter+19+Setting+Up+a+Mail+Server/Configuring+sendmail/
https://docs.oracle.com/cd/E56344_01/html/E53883/index.html
https://baike.baidu.com/item/sendmail/2250367?fr=aladdin
https://www.oreilly.com/library/view/sendmail-cookbook/0596004710/ch01.html
https://blog.csdn.net/z59d8m6e40/article/details/72871485
镜像地址
—————
https://www.proofpoint.com/us/sendmail/list-of-mirrors
下载地址
———————
https://ftp.sendmail.org/
http://ftp.ntua.gr/pub/net/mail/sendmail/
github
————–
https://en.wikipedia.org/wiki/Sendmail
错误信息“Deferred: 403 4.7.0 TLS handshake failed.”的处理
————————-
https://bobcares.com/blog/how-to-fix-error-403-4-7-0-tls-handshake-failed/
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