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DNS Problems


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since July 14th, about 4:00 PM (GMT) we have problems resolving bl.spamcop.net. We have our own Nameservers. Usually, DNS requests from our network are not filtered. But the problem is not limited to our DNS. At home, I have the same problem. My computer at home is connected to another ISP.

Has anyone seen something similar?



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bl.spamcop.net will never and has never resolved to anything.

To check whether an IP w.x.y.z is on the bl, you do a dns query on z.y.x.w.bl.spamcop.net. If it is not found, then the IP is not on the list.

What exactly are you seeing that changed on 14-jul?

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What I meant is that I don't get the IP adress for "bl.spamcop.net" anymore. So I can't use that in sendmail because all I get is a "temporary lookup failure". Our and the DNS servers from e.g. T-Online just can't get the IP for bl.spamcop.net.

# host bl.spamcop.net

Host bl.spamcop.net not found: 2(SERVFAIL)


It is a DNS problem that seems not to be limited to our DNS system. I want to find out where the problem is.

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As I stated another way, host bl.spamcop.net has NEVER resolved.

That is not a problem as there is no host named bl.spamcop.net.

Perhaps if you use this part of the FAQ, you will find out how to configure your server. Try:




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Right right. I was a little bit confused. Now I understand how it works. Yesterday I've stopped spam filtering with spamcop after we got temporary lookup failures. So I've tried to traceroute bl.spamcop.net (which doesn't exist) and I assumed that it was a DNS problem. Today I've tried the same with the same bad result, of course. Now I will reactivate the DNS based blocking again and see if it works.

Thank you for your help and have a nice day.


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