环境: rocky8.5 selinux和防护墙关闭。
安装: yum -y install sendmail sendmail-cf
配置:
编辑/etc/mail/sendmail.mc,大概在121行这个Addr参数就是指定监听的ip,把127.0.0.1修改成自己的ip或者0.0.0.0,也可以修改成网段之类的,这里不多赘述。修改后保存退出。
......
119 dnl # address restriction to accept email from the internet or intranet.
120 dnl #
121 DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl
122 dnl #
123 dnl # The following causes sendmail to additionally listen to port 587 for
......sendmail的配置文件是由m4这个工具生成，使用下面命令生成配置文件m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
之后编辑/etc/mail/access,在最后面追加以下内容，意为谁可以使用这个服务器来进行发送邮件。网段形式的ip可以这样写"192.168.0"。
Connect:0.0.0.0 RELAY启动：systemctl start sendmail
telnet测试邮件发送：
# telnet 127.0.0.1 25 #连接sendmail服务器
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
220 s ESMTP Sendmail 8.15.2/8.15.2; Sat, 23 Jul 2022 05:08:11 -0400
HELO boychai.xyz #和服务器说明我是那个域
250 s Hello localhost [127.0.0.1], pleased to meet you
mail from:admin@boychai.xyz #发件人
250 2.1.0 admin@boychai.xyz... Sender ok
rcpt to:1972567225@qq.com #收件人
250 2.1.5 1972567225@qq.com... Recipient ok
data #发送内容
354 Enter mail, end with "." on a line by itself
subject:hello #指定标题
hello sendmail #邮件内容
. #写好内容之后用"."结束
250 2.0.0 26N98BZR011316 Message accepted for delivery
quit #退出
221 2.0.0 s closing connection
Connection closed by foreign host.qq邮箱那边收到邮件之后可能会在垃圾桶里面，效果如下
