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1.5 SPF

Sender Policy Framework, or SPF for short, is an extension to SMTP protocol that allows to identify forged identities supplied with the MAIL FROM and HELO commands. The framework is explained in detail in RFC 4408 (http://tools.ietf.org/html/rfc4408) and on the SPF Project Site.

Mailfromd provides a set of functions (see section SPF Functions) for using SPF to control mail flow.

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