Today, reader John Carver kindly wrote in to let me know that this blacklist is indeed defunct and has "listed the world," installing a wildcard DNS record with the result that if you use ybl.megacity.org in your mail server configuration, you're going to reject 100% of your mail. Query of any domain or IP address under ybl.megacity.org will result in a "127.0.0.2" positive response, that will make a mail server think it should reject the email message in question.
If you use ybl.megacity.org as a blacklist in your mail server configuration, I strongly recommend you remove it immediately. The list is long dead, and use of the list will result in you accidentally rejecting 100% of inbound mail.
As recently as 2006, the DNSBL also responded with text warning that it was defunct: "521 The IP
Karmasphere has indicated that the feed service will be discontinued on November 16, 2009. It's very important that all Karmasphere-using mail administrators remove any Karmasphere-hosted DNSBLs from their configuration before that date, else inbound receipt of legitimate email messages could be delayed or otherwise impacted.
For more information, click on over to Spam Resource to read a copy of the Karmasphere notice.
As of this writing on April 29th, 2009, I do still see active entries when querying via DNS, but I assume that these are likely to go away soon. If you utilize this blacklist, I'd recommend removing it from your MTA or spam filter configuration.
Host blacklisted - Found on Realtime Black List server blocklist.address.is.wrong.spamhaus.org
Previous updates follow.
The real problem was for potential SORBS users – if they followed the instructions verbatim, they ended up rejecting 100% of your inbound mail. Sadly, I've seen traffic, which implies that this has happened to some degree.
If you're going to use the SORBS blacklist, be very careful to make sure you've implemented it correctly. Both this, and SORBS' claim that dnsbl.sorbs.net is an unsafe zone to use, suggest that the SORBS' list may not be a wise starting point for those looking to simply, safely block spam.
More information on SORBS can be found here.
There has never been a blacklist with a zone name of dnsbl.radparker.com -- and if you type that into the DNSBL section of your mail server config, you will break your inability to receive inbound mail.
August 17, 2009 update: A reader was kind enough to let me know that the TQMCUBE blacklist is now officially dead and gone. The TQMCUBE website now redirects to the website of another blacklist called the invaluement Anti-Spam DNSBL. Please see this page for more information.
Below find my commentary from 2007 from around the time the TQMCUBE project seemed to have first gone dormant.
From 2007: Various sources and my own investigation show that the website seems to be running on autopilot with nobody at the helm.
A postmaster at a large ISP contacted me and indicated that he had received no response to DNSBL remove requests submitted to TQM. Those requests were submitted on March 27th, and it is now June 30th (2007) that I write this article.
Other data points showing that the list appears to be unmanned and likely abandoned:
The list's website has a "last update" date of March 11, 2007.
The last known response received in reply to a blacklist remove request seems to have been in February, 2007.
I contacted David Cary Hart via email to the address on his domain registration on June 20th, 2007, and have not received a reply.
I contacted the abuse desk of his ISP (Fortress ITX) and asked them to confirm that he was alive. This was on June 24th. I received a ticket number but no other response.
The DNSBL's experimental world zone has not been operational since December, 2006.
The last known sighting of Mr. Hart online appears to be here, from April 2007.
This newsgroup posting from Colin Leroy on June 14, 2007 indicates that Colin had last seen email from Mr. Hart back in December, 2006. The email was a message posted to a mailing list that they both participate in.
- Others have indicated to me that they have called the telephone number in the TQMCUBE domain registration, and that the voice mail box associated with this phone number is full, no longer accepting new messages.
This thread in the news.admin.net-abuse.email newsgroup wondering why the list's administrators are non-responsive is typical of the discussion I've come across during my investigation. I am receiving numerous reports of issues with listings going unresolved. Additionally, when checked against my personal spamtrap data (8000+ spams/day) I am seeing the effectiveness of this blacklist trending downward over the past few weeks.
After careful consideration of all of the facts and discussion surrounding the status of TQM and its maintainer, I do not think it is wise to use the TQMCUBE blacklist.
November 25, 2007 update: Within the past week, a large number of entries have been removed from the TQMCUBE blacklist database. The Internet Wayback Machine suggests that TQMCUBE had 1.37 million IP addresses listed on August 29, 2007. As of today, November 25th, the TQMCUBE website suggests that there are approximately 851,000 active listings.
Confusingly, the zone still contains a test entry. Regardless, I've seen no hits against it in a very long time. Therefore, if you are using this DNSBL for spam blocking, I recommend you cease doing so.
If you have any further information about this blacklist, please feel free to contact me.