关于CBL
钉子大哥，我想使用CBL防御垃圾邮件，所有都按照你的帖子设好了使用的DNS是cblless.anti-spam.org.cn
返回状态码：127.0.8.5
但为什么我ping不通cblless.anti-spam.org.cn
提示
C:\Documents and Settings\zhangrongyi>ping cblless.anti-spam.org.cn
Ping request could not find host cblless.anti-spam.org.cn. Please check the name
and try again.
这样是否正常 D:\Documents and Settings\Administrator>ping cblless.anti-spam.org.cn
Pinging cblless.anti-spam.org.cn.home with 32 bytes of data:
Reply from 59.37.71.85: bytes=32 time=16ms TTL=58
Reply from 59.37.71.85: bytes=32 time=10ms TTL=58
Reply from 59.37.71.85: bytes=32 time=9ms TTL=58
Reply from 59.37.71.85: bytes=32 time=10ms TTL=58
Ping statistics for 59.37.71.85:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 9ms, Maximum = 16ms, Average = 11ms ping cblless.anti-spam.org.cn没有多大意义，你试试某一个在CBL－数据库的IP反过来写再加cblless.anti-spam.org.cn能不能ping 通。比如IP是127.0.0.2，反过来写就是2.0.0.127.cblless.anti-spam.org.cn
然后去Ping 2.0.0.127.cblless.anti-spam.org.cn看是否能PING通。如果返回值是127.0.8.5的话，就表示这个IP在CBL-中。 那我怎么验证我使用CBL是成功的呢 这么简单，你在一个已经CBL-中的IP电脑上Telnet你自己的服务器25端口发信，看会不会拒绝即可。下帖中有类似演示产：
http://www.5dmail.net/bbs/viewthread.php?tid=173761&extra=page%3D1%26amp%3Bfilter%3Ddigest
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