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07 Dec 2008
Several proposals for Lightweight MTA Authentication Protocol (LMAP) have been gathering attention of late. They all define ways for a domain to specify that some particular IP addresses are allowed to send mail for that domain, and others aren't.
LMAP has a variety of technical problems because there are surprisingly many ways that mail can be sent from unexpected places.
Selective Sender, a simpler scheme that has been proposed before under other names, is much simpler.
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