421 RLY:B3 由于IP发信地址信誉较低受到发送限制

退信信息：

Hi.Thisistheqmail-sendprogramatmx29.dns.com.cn.

I'mafraidIwasn'tabletodeliveryourmessagetothefollowingaddresses.

Thisisapermanenterror;I'vegivenup.Sorryitdidn'tworkout.

<[e-mail] >:

Connectedto205.188.190.1butgreetingfailed.

Remotehostsaid:4214.7.1:(RLY:B3)http://postmaster.info.aol.com/errors/421rlyb3.html

I'mnotgoingtotryagain;thismessagehasbeeninthequeuetoolong.

根据退信提示，点击链接地址，查看报错原因：

421 RLY:B3

• The IP address you are sending from has been temporarily rate limited due poor reputation. Please visit this page for tips to improve your IP reputation

报错原因就是： 发信地址由于IP信誉问题暂时受到发送限制，根据提示点击“IP reputation”，进入AOL，以下是主界面：

点击“Check your IP reputation”进入信誉查询界面：

输入IP和验证码之后，可以看到查询结果：

以上显示结果就是“信誉较低”