Status of dnsblchile.org: ALIVE

DNSBL Chile, created in 2011, appears to be a Chilean homegrown effort to tackle spamblocking from a local perspective. As they explain on their website: "Existing DNSBL services aim to block spam based on the type and origin affecting certain types of user. Chilean spam is generally ignored by these DNSBLs, mainly because of the language barrier. This raises the need for a specific DNSBL for Chile, which is able to investigate cases of spam in South-American Spanish."

The DNSBL zone is just "dnsblchile.org" and they report a few different types of responses: 127.0.0.2 and 127.0.0.3 for "verified spam sources," 127.0.0.5 for "verified scam sources," and 127.0.0.10 and 127.0.0.11 for DUL/PBL-like dynamic/"should not be running an MTA" entries.

I don't know much about this list in particular but it's always nice to see somebody attempt to address a previously segment or region's spam problem.  If you have any thoughts or details around this list, don't hesitate to drop me a line.

(Crappy translation above courtesy of my high school Spanish + a little help from Google Translate.)

Status of APEWS: ????

Long-standing (though not very accurate) blocking list APEWS seemed to be down for the count. Their website at www.apews.org has been down since March 15th, according to David Ritz.

My recommendation to mail administrators is to stop using APEWS. But then again, was anybody using APEWS recently, anyway?

For history's sake, here's a link to the article I published long ago, explaining what to do if you find yourself listed by APEWS.

APEWS was previously down for three weeks in August, 2010.

Update: APEWS appears to have returned somewhere around May 1st, 2013.

It goes down, it comes back up, it goes down again, it comes back up again. At this point I think we'll just call it a status of "?????"

Status of spamtrap.trblspam.com: DEAD

The DNSBL spamtrap.trblspam.com appears to have gone offline as of April 2, 2013. It appears to have been created in early 2011 by somebody known as "Tom from TRBL," whom I observed participating in various email discussion lists. I've emailed Tom and will update this page if I receive any further details.

I recommend removing spamtrap.trblspam.com from any blocklist checking you're doing. Any time a list is shut down, there's a chance that they will end up putting in a wildcard DNS record, which ends up effectively "listing the world" and causing problems for any receiving sites who still have that DNSBL configured in their mail server configuration.

(Thanks to Martijn Grooten for the heads up.)

Status of dnsbl.njabl.org: DEAD

It is with sadness that I report  on the closure of Jon Lewis's NJABL blocking list.  From the NJABL website: "March 1, 2013: NJABL is in the process of being shut down. The DNSBL zones have been emptied. After "the Internet" has had some time to remove NJABL from server configs, the NS's will be pointed off into unallocated space (192.0.2.0/24 TEST-NET-1) to hopefully make the shutdown obvious to those who were slower to notice."

NJABL (Not Just Another Bogus List) had been in existence from at least January 2002. Congrats to Jon and team for a pretty good run of eleven years.

Update: I received this in email: "Today, April 29, 2013, NS for the NJABL DNSBL zones is being pointed into 192.0.2.0/24 (TEST-NET-1) which is unrouted IP space.  This will likely cause any systems using the NJABL DNSBL zones to experience long delays in DNS resolution of NJABL DNSBL lookups.  This is being done both to sink the DNS query traffic and to hopefully be noticed by the owners/managers of those systems."

(H/T: Laura Atkins and others.)

Status of bl.csma.biz: DEAD

An entity called McFadden Associates had been publishing two different, spamtrap-driven DNSBL zones starting from October 2003. Almost ten years later, it appears that these blocklist zones are no more.

The McFadden CSMA blocking list encompassed two different DNSBL zones. The primary zone, bl.csma.biz, contained only "aggressive" hosts that have spammed repeatedly during a short (recent) timeframe. An additional zone, sbl.csma.biz, had a broader listing criteria, noted by the publisher as more suitable for scoring in a filtering system than outright blocking.

As of January 2013, querying either zone will result in a false positive response, showing that an IP address is blocked, due to a wildcard DNS entry. This means that you should immediately stop using either DNSBL in your spam blocking configuration, otherwise you will reject all inbound mail, legitimate or not.

It's fairly common for a list, when dying, to intentionally or un-intentionally "list the world," answering any DNS lookup request with what amounts to a "yep, that's blocked" response. This regularly causes problems for unsuspecting email system administrators who may still be querying blocking lists that are now out of commission. That's why it's important to periodically review your inbound mail server's configuration to revisit what DNSBL lists you might be using and whether or not it makes sense to continue to use them.

In this case, these lists are no more, and should be removed from any mail server configurations where they may still linger.

I've reached out to the one-time publisher of these lists, and I will follow up with more information if he's able to provide more details.