Sender Permitted From (http://spf.pobox.com/)is designed to authenticate who is allowed to send mail for a domain.
I wonder if this can take off, in the face of so many people who have grown accustomed to sending legit mail with a sender address that has no relation to the account and domain they are using to send the mail. Like my columbia.edu address when I send from my home ISP's smtp server. Like my vanity domain address when I send from the ISP that provides connectivity to the hotel room I am in today. Not that I think this widespread "forging" of sender addresses is good. But it is widespread.
Joseph Brennan Columbia University in the City of New York Academic Technologies Group [EMAIL PROTECTED]
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