General-Purpose Mail Filter
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
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 SPF Functions) for using SPF to control mail flow.
This document was generated on January 3, 2019 using makeinfo.Verbatim copying and distribution of this entire article is permitted in any medium, provided this notice is preserved.