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Re:IPv6 Will Worsen the Spam and Malware Problems by mike-cardwell on Monday December 20, 2010 @02:54PM (#2025522)
You're describing SPF and DKIM. Both of which can be used by people sending legitimate mail, and people sending spam...

SPF and DKIM are good for preventing some false positives. They're not good for stopping spam.

I would bet that currently, well over 90% of spam that is rejected, is rejected because of blacklist lookups.

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