Several related articles in re the energy consumption of spam, and the economic/energy returns earned by countering it effectively:
http://www.crn.com/security/216500943;jsessionid=PIRZRMECSH3WOQSNDLPCKH0CJUNN2JVN http://news.cnet.com/8301-1023_3-10220363-93.html http://www.newsfactor.com/news/Blocking-Spam-Would-Cut-Pollution/story.xhtml?story_id=03300316RKPR Hardly as scientific, but Exim with tightened rDNS filtering et al has allowed us to drop from Core-2 Duo 3 GHz to VIA C3/C7 at a mere fraction of former power consumption...and cost. YMMV, but what works here is to reject it early, not analyze and 'play' with it. Bill Hacker -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
