小编scr*_*apy的帖子

$ uname -a
Linux xxxx 4.9.0-4-amd64 #1 SMP Debian 4.9.51-1 (2017-09-28) x86_64 GNU/Linux

$ cat  /etc/aliases
# See man 5 aliases for format
postmaster:    root
root:          root@xxxx.xxxx

没有人收到的电子邮件。

$ sudo mail -f  /var/spool/mail/nobody
"/var/spool/mail/nobody": 23 messages 1 new 19 unread
     1 Anacron            Tue Jan  9 00:07  20/823   Anacron job 

'cron.daily' on xxxx
From: Anacron <root@xxxx.xxxx>
To: root@xxxx.xxxx
Subject: Anacron job 'cron.daily' on xxxx
Content-Type: text/plain; charset=UTF-8

为什么发送给 root 的电子邮件会重定向给任何人？

$ sudo mail -f  /var/spool/mail/root
/var/spool/mail/root: 0 messages

root 的邮箱中没有电子邮件。
给root发送邮件进行测试。 …

vim /etc/postfix/main.cf
smtpd_recipient_restrictions = check_sender_access hash:/etc/postfix/access

在 /etc/postfix/access 中添加一些 ips

vim  /etc/postfix/access
86.111.171.141  REJECT 
191.96.249.63   REJECT

重新启动后缀。

postmap hash:/etc/postfix/access
systemctl restart  postfix       

几次之后。

tail  /var/log/maillog
Oct 30 10:18:45 localhost postfix/smtpd[3491]: connect from unknown[86.111.171.141]
Oct 30 10:18:45 localhost postfix/smtpd[3491]: warning: unknown[86.111.171.141]: SASL LOGIN authentication failed: authentication failure
Oct 30 10:18:46 localhost postfix/smtpd[3491]: disconnect from unknown[86.111.171.141]      
Oct 30 10:18:45 localhost postfix/smtpd[3491]: connect from unknown[191.96.249.63]
Oct 30 10:18:45 localhost postfix/smtpd[3491]: warning: unknown[191.96.249.63]: SASL LOGIN authentication failed: authentication failure
Oct 30 10:18:46 localhost postfix/smtpd[3491]: …