I think a DB of known spam URL's is safe. Following URL's makes me nervous...
Then SURBL should be fine. It's just a RHSBL, built from domains advertised in spam rather than domains that (appear to) send it. A client using SURBL just parses URLs out of the message and queries the domain names against the SURBL zone.
Kelson Vibber
SpeedGate Communications <www.speed.net>
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