postfix防止黑客破解密码用户被利用滥发垃圾邮件

Hello, My friend

2014-04-04 20:11:01 Please be noted the following email box cannot send email from now on.?weiping.jiang@tse-mail.com

We terminate the email sending function for this email address as this email box send out too many emails within little times. We suspect this email address password is stolen by others. Please contact the owner of the email address to change the password. After that, please let me know and I will then refresh all the functions to this email box.

You should better send mail to me,service@tse-mail.com

If you own this email box, you can contact me with tel: 86-15001928480

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上面的是自己在研究为什么那么多的自建邮件服务器容易被列入国际黑名单中,最主要是由于若密码简单没有好好的维护导致被黑客暴力破解出,其次是由于被垃圾病毒邮件攻击客户端电脑当作肉鸡。这两种原因都是最终没有很好的监控防护措施,让黑客轻易的将邮件从服务端将邮件发送出去。现在postfix就有有一个功能,只要在每5或者10分钟的前后2端检查发送超过多少封可以根据平时观察设定,一旦超过这个数字即不正常现象,当然可以给个别用户开多点。但是要是一下超过几倍即不正常。另外还有个参数就是每天设定一个上限。超过就锁定。这样可以很好的让你的IP信誉度和提高邮件安全性。当然使用RelayPod电邮的邮件中继也可以解决这些麻烦的问题,不需要你自己费神。