At-- SURBL usage policy: http://www.surbl.org/usage-policy.html
I get very different pricing depending whether I input 80,000 users or 80000 users (same number, no comma).
Number of messages does not affect it.
At the price for 80,000 (sic) I have no objection at all. At the other price I'll really have to analyze how much we block with it. I'm not sure what conclusion I will reach.
Joseph Brennan Lead Email Systems Engineer Columbia University Information Technology