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Blacklists Re-visited
Now and again, SpamButcher is subject to a fresh evaluation of its technologies used to filter email spam .
For sometime the option to use a DNS Blacklist has been disabled by default. It was turned off a number of years ago due to a specific problem regarding one of the default blacklist providers, and general issues regarding performance and the possibility of false-positives.
Time has passed, so it seems reasonable to take another look. How have DNS blacklists changed in the last few years?
The players have definitely changed. A lot of the older lists have vanished, or at least aren't maintained. A website that has a "latest news" section with the most recent entry being in 2003 does not bode well for the status of the related database.
The popular and most effective blacklists seem to be meta-lists. That is, they are automated compilations of other blacklists, with some rules applied in the process to help better fight spam.
In another shift, more lists now seem to specify specific IP addresses as opposed to IP blocks or networks. This allows for a higher degree of specificity when blocking possible spammers. It also makes for a lot of "zone data" with the possibility of bloat.
For example, the CBL Blacklist contains over 3.6 million individual IP entries.
Some pragmatic first-hand research indicates these blacklists can help stop additional spam. I also know first-hand that these same lists can and do block legitimate messages. For now, Blacklist functionality stays off by default.