"The SPF Record Format and Sender-ID Protocol", Meng Weng Wong, 16-Sep-04. (74521 bytes)

This document defines a protocol for the authorization of Internet hosts to use domain names in the sender mailbox of mail that those hosts send. Authorization records are published in DNS for domain names that may be used as part of sender mailboxes. Mail receivers then perform a check against those records to see if a client host submitting a piece of mail is actually authorized. Since there are several different concepts of sender mailbox, this protocol is generic and can be applied to one or more of such "scopes".

"Authorizing Use of Domains in MAIL FROM", Mark Lentczner, Meng Weng Wong, 16-Sep-04. (24955 bytes)

Mail on the Internet can be forged in a number of ways. In particular, existing protocols place no restriction in what a sending host can use as the reverse-path of a message. This document describes a protocol whereby a domain can explicitly authorize the hosts that are allowed to use its domain name in a reverse-path, and a way for receiving hosts to check such authorization.

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