Jestrzcap writes "This just posted on Freshmeat: FairUCE (which stands for 'Fair use of Unsolicited Commercial Email') is an SMTP proxy, running between multiple instances of Postfix, that verifies email by attempting to verify the sender through lookups (a user customized challenge/response). It claims to be able to 'stop a vast majority of spam' without the need for content filters, and 'virtually eliminates spoofed addresses, phishing, and even many viruses with a few cached DNS look-ups and a couple of if/then statements'."
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