MTA Authorization Records in DNS (marid) Concluded WG

Note: The data for concluded WGs is occasionally incorrect.

WG Name MTA Authorization Records in DNS
Acronym marid
Area Applications Area (app)
State Concluded
Charter charter-ietf-marid-01 Approved
Dependencies Document dependency graph (SVG)
Personnel Chairs Andrew Newton
Marshall Rose
Tech Advisors Rob Austein
Roy Arends
Mailing list Address
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Charter for Working Group

It would be useful for those maintaining domains and networks
to be able to specify that individual hosts or nodes are authorized
to act as MTAs for messages sent from those domains or networks.
This working group will develop a DNS-based mechanism for
storing and distributing information associated with that

The primary current use case for this facility is to allow recipient
MTAs to confirm that peer MTAs' actions are authorized by
specific domains or networks. This will help combat a certain
class of domain forgery common in spam. The solution chosen,
however, should be generally useful for others which might
check this authorization data.

This working group is being chartered after extensive discussion of
the issues in the IRTF's Anti-spam Research Group, and it is presumed
that all active participants will be familiar with the documents
produced there which describe the problem. It is not, however, an
extension of that research group; it has no general writ to study spam
or to produce specifications on the topic. It will not consider
anti-spam abatement measures outside of the area of MTA authorization.

Because individual messages may be associated with multiple domains
(among them the domains present in the RFC2822 From, RFC2822 Sender,
the SMTP Mail-From, and the SMTP EHLO), the first task of the working
group will be to establish which of these identities should be
associated with MTA authorization. Once this decision has been
reached, it will limit the scope of further activity in this working
group, and the chairs will rule out of order discussion related to
schemes which use other identities as the basis of authorization.

The groups Technical Advisors will help ensure that the semantics of
proposals originating within this group are consonant with DNS
standards and syntax, and they will be available for early cross-review
to ensure that this work proceeds at an appropriate pace.

Upon chartering of this working group, the IESG intends to request
that the IRTF Chair and the Chairs of the IRTF's Anti-Spam Research
Group seek publication of the listed input documents as Experimental
RFCs, so that they are available on an archival basis. The IESG also
intends to request that the RFC editor insert a note into each document
informing the reader that the IETF's MARID working group has taken on
the task of producing a standard in this area.


Date Milestone
Aug 2004 Enter FIN_WAIT
Aug 2004 Submit working group document on MTA Authorization Record in DNS to PS
Jul 2004 Working group last call
Jun 2004 Final selection of syntax and document review of selected proposal
Done Publish one or more syntax proposals to meet required semantics
Done Interim Meeting. Focus on required semantics for MTA authorization; syntax discussions
Done Discuss identities with which MTA authorization used for MTA authorization