Email authentication/External Links
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- Please sort and annotate in a user-friendly manner and consider archiving the URLs behind the links you provide. See also related web sources.
DNS Surveys - latest annual surveys on deployment of authentication records
RFC-5451, "Message Header Field for Indicating Message Authentication Status", M. Kucherawy. 2009. - IETF Proposed Standard. A new email header field with results of message authentication.