The IESG has approved the following document: - 'ESMTP and LMTP Transmission Types Registration ' <draft-newman-esmtpsa-01.txt> as a Proposed Standard This document has been reviewed in the IETF but is not the product of an IETF Working Group. The IESG contact person is Ned Freed. Technical Summary This registers seven new mail transmission types (ESMTPA, ESMTPS, ESMTPSA, LMTP, LMTPA, LMTPS, LMTPSA) for use in the "with" clause of a Received header in an Internet message. Working Group Summary This document was reviewed on the ietf-smtp@imc.org mailing list but is not a product of an IETF working group. Protocol Quality Ned Freed reviewed the document for the IESG. RFC Editor note The acronyms in the title need to be expanded to somethig like: "Extended SMTP and Local Mail Transfer Protocol (LMTP) Transmission Types Registration" Please change the second paragraph of the security considerations to read: These keywords are not normally protected in transport which means they can be modified by an active attacker. They also do not indicate the specifics of the mechanism used, and therefore do not provide any real-world security assurance. They should not be used for mail filtering or relaying decisions except in very controlled environments. As they are both cryptic and hidden in trace headers used primarily to diagnose email problems, it is not expected they will mislead end users with a false sense of security. Information with a higher degree of reliability can be obtained by correlating the Received headers with the logs of the various Mail Transfer Agents through which the message passed.
