A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : DKIM Third-Party Authorization for Sender Signer Practices
Author(s) : D. Otis
Filename : draft-otis-dkim-tpa-ssp-03.txt
Pages : 14
Date : 2008-02-25
TPA-SSP (DKIM Third-Party Authorization for Sender Signing Practices)
is a DNS-based label prefix mechanism for authorizing Third-Party
domains. This mechanism allows a first-party domain to autonomously
authorize a range of third-party domains in a scalable, individual
DNS transaction. This authorization can extend the scope of DKIM-SSP
policy assertions and eliminate more difficult to administer
mechanisms. Alternatives for facilitating third-party authorizations
currently necessitate coordination between two domains by setting up
selector/key DNS records, DNS zone delegations, or the regular
exchange of public/private keys.
Checking Sender Signing Practices occurs when a From header email-
address is not within the domain of a valid DKIM signature. When a
Third-Party signature is found, TPA-SSP offers an efficient means for
the email address domain within the From header to specifically
authorize other third-party signing domains. The scope of the
authorization may also assert identity authentication for Sender and
Resent-* headers for email-addresses within the signing domain.
Identity authentication within the From header domain may be asserted
by the scope of the authorization, even when signed by a Third-Party
domain. In addition, the RFC2821.MailFrom domain can authorize
domains for controlling DSNs.
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