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DKIM daemon
DomainKeys Identified Mail x SPF
- signing mail headers by outgoing mail server
- we can verify this signature (public key in DNS)
- these headers can't be faked
- it doesn't mean, that such mail is not spam
- can be only used as one of spam decision criteria
- still in process of standardization (IETF WG)
- http://www.dkim.org/
Supported by many big companies
- AOL, Cisco, IBM, Sendmail, Yahoo, ...
- and used by many other
Implementation