While trying to figure out what to write today, I checked Facebook. Where I saw a post on the Women of Email group asking for help with a Spamhaus listing. I answered the question. Then realized that was probably useable on the blog. So it’s an impromptu Ask Laura question. We’re listed on Spamhaus’ list, any advice on how to get off? Our email provider has a plan, just looking...
I’ve been talking about security more on the blog. A lot of that is because the security issues are directly affecting many senders. The biggest effect recently has been on companies ending up on the SBL because their signup forms were the target of a subscription attack. But there are other things affecting online spaces that are security related. Right now not much of it is affecting...
There’s been a discussion on the mailop list about the number of different blocklists out there. There are discussions about whether we need so many lists, and how difficult the different lists make it to run a small mail system (80K or so users). This discussion wandered around a little bit, but started me thinking about how we got to a place where there are hundreds of different...
I started seeing some folks complain about false CBL listings a few hours ago. I’m now seeing the same folks saying the listings are being removed.
The symptoms look similar to what happened in November (mentioned here), but it appears the CBL team are on top of things and are working to rectify things quickly.
As we head into the last month of the year, we look back at our November adventures. I spoke twice this month, first at Message Systems Insight in Monterey (my wrap-up post is here) and then with Ken Magill at the at the 2015 All About eMail Virtual Conference & Expo (a short follow-up here, and a longer post on filters that came out of that discussion here.). Both were fun and engaging...
The CBL issued a statement and explanation for the false positives. Copying it here because there doesn’t seem to be a way to link directly to the statement on the CBL front page. November 24, 2015 Widespread false positives Earlier today, a very large scale Kelihos botnet event occured – by large scale, many email installations will be seeing in excess of 20% kelihos spam, and some...
Update: As of Nov 24, 2015 11:18 Pacific, Spamhaus has rebuilt the zone and removed the broken entries. Expect the new data to propagate in 10 – 15 minutes. Delivery should be back to normal. The CBL issued a statement, which I reposted for readers that find this post in the future. I think it’s important to remember there is a lot of malicious traffic out there and that malicious...
The CBL website is back on line. It’s possible that your local DNS resolver has old values for it cached. If so, and if you can’t flush your local DNS cache, and you really can’t wait until DNS has been updated then you may be able to put a temporary entry in your hosts file to point to cbl.abuseat.org. You can get the IP address you need to add by querying the nameserver at ns...
Spamhaus has mostly mitigated the dDOS against the Spamhaus website and mailserver, but now the CBL is under attack. They have been working to get that under protection as well, but it’s taking some time. Right now there are no public channels for delisting from the CBL. The Spamhaus Blog will be updated as things change, and I’ll try and keep things updated here as well. UPDATE:...
We run top-level DNS servers for several blacklists including the CBL, the blacklist of infected machines that the SpamHaus XBL is based on. We don’t run the CBL blacklist itself (so we aren’t the right people to contact about a CBL listing) we just run some of the DNS servers – but that means that we do get to see how many different ways people mess up their spam filter...
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