On: Summary of June 29 AWS Service Event in US-East

[rdl]

I have never understood the design decision to require zone apex to be an A Record. (I mean, I know that is what the RFC says, but I don't know what the RFC authors were thinking back in ancient times.)

[zhoutong → rdl]

Well, disregarding the design decision, or the RFC, it's basically wrong to use CNAME alongside of other records, especially MX records.

Considering most active domains have MX records under the root host name (like example.com.), CNAMEs won't work for these hostnames.

If there's native implementation for an "ALIAS" record which only points to the corresponding A record of the target, then it will work anywhere.