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Re: [ietf-smtp] MTS-STS validation when MX host points to a CNAME, violating RFC 2181 § 10.3

2021-04-06 15:33:48
On Tuesday 6 April 2021 22:04:48 CEST, Kristijonas Lukas Bukauskas wrote:
I believe O365 clients of *paid* services could argue this is a breach of the contract. A client wants to deliver a message to user(_at_)example(_dot_)com. Sending MTA misleadingly says: Receiving MTA of user(_at_)example(_dot_)com has the problem A (MTA-STS validation failed), that's why we can't provide you a service you paid for. If that's not the case (and I suppose it's not: RFC8461, section 4.1 defines MX host Validation by matching MX record *name* against MTA-STS policy; the end).

Look it up and quote chapter and verse, please. I don't see anything of the kind. I do see wording in "my" enterprise documentation that IMO suggests a required ability to send to working sites, but nothing that requires Microsoft to provide a correct analysis of what is broken at sites outside Microsoft's control.

Arnt

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