Hi, OPS-DIR, Authors, I have reviewed this document as part of the Operational directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written with the intent of improving the operational aspects of the IETF drafts. Comments that are not addressed in last call may be included in AD reviews during the IESG review. Document editors and WG chairs should treat these comments just like any other last call comments. This standard track document updates “DomainKeys Identified Mail (DKIM) Signatures”, mainly obsolete the sha1 hash algorithm and define the shortest key length. This is shortest document I even reviewed. It is well written and READY to be published. Major issue: none. Minor issue: none Best regards, Sheng