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 for using SPF to control mail flow. These are described in SPF Functions.
DomainKeys Identified Mail (DKIM) is an email authentication method designed to detect forged sender addresses in emails. Mailfromd supports both DKIM signing and verification. See DKIM, for a detailed description of these features.
Mailfromd also provides support for several third-party
spam-abatement programs, in particular SpamAssassin
,
ClamAV
, and DSPAM. These are discussed in
Interfaces to Third-Party Programs.
This document was generated on August 13, 2022 using makeinfo.
Verbatim copying and distribution of this entire article is permitted in any medium, provided this notice is preserved.