> Overall blacklists aren't that effective and cause a lot of false
> positives. They may make sense in the case of something like
> SpamAssassin which uses a blacklist in conjunction with other false
> positives, but by themselves they really aren't a responsible way of
> dealing with the spam problem. I think it's better to discourage "worst
> practices" than to sucumb to plugin mania.
Blocklists aren't fundamentally broken, they are a tool which can be used
properly or misused (just like many other tools).
Many admins choose to maintain their own DNSBLs for one reason or another.
It may be a way to control relay access based on their own subscriber IP
addressess. At my site we keep a record of IPs that have persistently
abused our site over the past few days.
i.e. DNSBL != (SPEWS or MAPS or whatever)
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