I've received a malicious spam from the following address:
Received: from unknown (HELO 74-142-212-17.dhcp.insightbb.com) 
(74.142.212.17)

I'm a little surprised that the address hasn't been blacklisted, being 
an apparent dynamic address. I'm using
dns-blacklist-entry=zen.spamhaus.org
dns-blacklist-entry=bl.spamcop.net

Is there a good way to block public hosts with dhcp in their name?
Is there a better approach to this?

-- 
-Eric 'shubes'

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