世界上rbl黑名单组织种类繁杂，大概有百十来个。其中比较著名的例如spamhaus，spamcop，cbl，pbl等。之前给大家讲过怎么处理spamhaus和cbl的黑名单申诉问题，今天给大家讲一下，spamcop的黑名单退信怎么处理。

From: Mail Delivery System
To: verstegen@adk-msi.de
Sent: Sat Jan 18 19:49:08 2014
Subject: Undeliverable: Ich hatte keine mail bekommen von dir
Delivery has failed to these recipients or distribution lists:
verstegen@adk-msi.de
Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.
The following organization rejected your message: maildomain.datevnet.de.

Diagnostic information for administrators:
Generating server: **.******.com
verstegen@adk-msi.de
maildomain.datevnet.de #<maildomain.datevnet.de #5.7.1 smtp; 554 5.7.1 Service unavailable; Client host [**********] blocked using bl.spamcop.net; Blocked - see http://www.spamcop.net/bl.shtml?***********> #SMTP#
Original message headers:

      很明显，上面这一封退信就是spamcop的退信，文中maildomain.datevnet.de #5.7.1 smtp; 554 5.7.1 Service unavailable; Client host [**********] blocked using bl.spamcop.net; Blocked - see http://www.spamcop.net/bl.shtml?***********。也标注的很清楚spamcop的退信申诉问题。只要点进去链接。

就会出现这个页面，点击Information about the reasons for listing (blocking) your mail server (*******)就会出现了申诉的窗口。申诉一般很难根本性的解决问题，只有多条线路互备，才能有备无患，所以强烈推荐思威电邮的海外邮件中继服务。你值得拥有。