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Old 3rd September 2009
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jggimi jggimi is offline
More noise than signal
 
Join Date: May 2008
Location: USA
Posts: 7,977
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Here's a graphic from one of Bob Beck's (beck@) presentations on spamd(8). This one shows nine different servers involved with e-mail processing at the University of Alberta in 2006. Note that the bastion routers are running CARP and acting as round-robin load balancers.

http://www.ualberta.ca/~beck/nycbug06/spamd/mgp00019.html
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