On 7/13/23 10:49 AM, Bill Cole via mailop wrote:
It's not at all logically hard to meet that arbitrary requirement, you just need a zone cut everywhere you have a MX record. I've run a DNS and mail hosting environment that way. Zone files are very small and numerous. *Logistically* changing an existing zone with many MXs for subdomains to that model could be a serious chore.
I question the veracity of "need a zone cut everywhere you have an MX record".
My current working understanding is "you need a zone cut for domains immediately subordinate of the PSL".
My (limited) personal testing supports not needing a zone cut for a sub-domain of my personal domain.
Grant. . . . _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
