Extended Options for DomainKeys Identified Mail (DKIM)

Document Type Expired Internet-Draft (individual)
Last updated 2005-12-27
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document describes options that extend protections offered by DKIM. These options include Binding-Advice & Role-Assertion, Opaque- Identifier, and an In-Channel check. The Binding-Advice & Role- Assertion offers guidance in isolating the source of a message, in addition to establishing message signature expectations. The Opaque- Identifier (O-ID) offers protection from replay abuse and intra- domain spoofing, even when email-addresses are not associated with the signing-domain. The In-Channel check provides a means to mitigate DNS lookups for avoiding possible message replay abuse.


Douglas Otis (doug_otis@trendmicro.com)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)