All 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 document is the underlying specification in electronic mail and its movement across the internet. I actually reviewed this document during the working group last call process, and worked through several comments John L and John K addressed then. I have been also following the DNSDIR review thread, and feel confident the are addressing those issues to me satisfaction. One Nit: The acknowledgement section has this partial paragraph - some bad xml? chetti contributed an analysis that clarified the ABNF productions that implicitly reference other documents.