I have reviewed -29 of this draft for dnsdir, with -26 having been previously reviewed for dnsdir by Scott Rose.

Per his earlier review, there's only a small portion of this document that deals with interacting with the DNS, section 2.1. His earlier comment suggested that IPv6 records be mentioned explicitly alongside for IPv4 for "address records", and this revision has included that suggestion.

There are other references to DNS-published, email-specific records in Section 6, like for SPF, DMARC, DKIM, and DANE, and but they don't really change anything with regard to the DNS aspect of them.

I did read this entire document with the eye of a prosumer email user and administrator, and think it is a solid guide to the current suite of email RFCs.