Knoxscape deep thoughts
Wednesday, August 20, 2003
SMTP+SPF: Senders Permitted From: "SMTP has a security hole: any connecting client can assert any sender address. This flaw has been exploited by spammers to forge mail. Close the hole, and we can easily block spammers by sender domain"

We're all interested in the battle against spam. Here's a mechanism for checking if an email came from a legit source.
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