Internetworkers: http://www.ibiblio.org/internetworkers/

[Thomas Beckett <thomas AT tbeckett.com>]

"Spam is a thousand times more horrible than you can ever imagine," 
Shein said. "The entire Internet mail system is under a 
denial-of-service attack."

http://www.internetweek.com/breakingNews/INW20021219S0003

At one point, The World was under attack by 200 servers simultaneously 
"spewing the same spam at us," Shein said. "Little guys with scripts 
don't break into 200-plus servers and use them to spew at you. It seems 
like it's beyond what spammers are likely to be making on this stuff." 
Sophisticated stealth techniques and coordinating multiple servers seem 
to Shein to be beyond the resources of small spam businesses.