This is an implementation of DomainKeys draft standard for the Postfix mail
transfer agent.  DomainKeys is proposed by Yahoo!, Inc. and this is a scheme
to sign and verify e-mail messages on a per-domain basis.
Protocol and other issues about this draft standard can be found at
http://antispam.yahoo.com/domainkeys.

WWW: http://jason.long.name/dkfilter/