http://www.securityfocus.com/infocus/1763
http://securityfocus.com/infocus/1766
A two-part well-referenced article [the link to the first part appears at the end of the second, but the first part has no link to the second -- hence both links] by a noted expert on spam, the battle against it, and the security issues involved [identity theft, malware propagation, and combined exploits].
Filters are seen as limited, at best. Reverse lookup will help control header forgeries, but will leave those whose domains do not host a mail server out in the cold, while also causing problems for mobile computing. Challenge systems and cryptographic systems also have their limitations.
The conclusion to this article is rather depressing: "...a good solution today is unlikely to be a good solution tomorrow".
A related white paper, discussing "E-mail spam: Is it a Security Issue?", is available here:
http://www.WindowSecurity.com/pages/article.asp?id=1311
Another article, indicating that the spammers are 'winning' this war [of course, their 'victory' will prove disgustingly barren], with indications that 80% of USA e-mail traffic is spam, can be read here:
http://www.baltimoresun.com/technology/bal-te.spam14mar14,0,3015793.story
The technology of turning intermediate machines into spam zombies exacerbates the problem -- and increases the desirability for condign punishment for the perpetrators.
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