SATOS Blacklist Obsolete

We received word (thanks, Jeremy!) that the SATOS blacklist is defunct. Although we did not receive word of this from the blacklist owner when they first shut it down, the blacklist has been returning false positives in order to capture the attention of anyone still using the blacklist.

SATOS has therefore been removed from our blacklist lookup tool.



Today, Matt Cutts (Head of Google Webspam team) announced improvements to Google’s spam reporting form, saying via Twitter: “We just released the biggest refresh of our spam report form in, oh, say 10 years”:

There are a lot of forms for reporting various types of webspam to Google now. Hopefully these tools will help to reduce the amount of webspam out there, and with Google’s excellent track record, we should see some good results.

We’ll assume that any reports that are made receive human review before blacklisting/filtering, so that false reports (e.g. competitive harassment) are quickly culled. If your company experiences unjustified filtering (as judged by industry-sanctioned practices) by any of the new web filtering tools in practice today, however, we’d like to know about it. We, like most of you, would like to see spam filtering perfected to the point that true spam is filtered but legitimate email and web traffic is not filtered.


We’ve received inquiries from customers who have used our Email Blacklist Tool to check their IP address and found it clean, except for the FIVETENFREE lookup. If this happens to you, our response depends on your answer to the following question: did this email blacklist cause you to have rejected email, or are you just being proactive?

The reason we ask this is that the FIVETENFREE email blacklist has been known to produce a relatively high percentage of false positives.

For example, my personal IP, given to my computer dynamically, is on their blacklist.

Here’s what their site says when I run the test on my current personal computer IP:

“misc.spam. If you are not running a mail server on (X), this listing should not affect you in any way, and you should ignore whatever source told you that this might be a problem.

The misc.spam group is mostly (but not entirely) composed of entire addresses blocks that have a) sent spam here, b) have consecutive or missing reverse dns, and c) have no customer sub-delegation via either the controlling RIR (ARIN, RIPE, LACNIC, APNIC, etc) or an rwhois server referenced in the main RIR records.”

So, the problem ends up being my IP address reverse-DNS doesn’t correspond to my domain name, and they also don’t like the TTL for my A record. Of course, none of this is under my control, it is controlled by my ISP.

So, as they suggest on their own site, I should ignore this.

We suggest you do the same unless it is causing email problems. To go to their site directly to test your own IP, and find out why it’s listed, go to: