So, at least for the time being, it appears that the Y! universe handle
this in a non-deterministic manner.
Lovely.
On 07.05.2023 11:57, Ken Peng via mailop wrote:
May 7, 2023 at 2:17 PM, "Matt Palmer via mailop" <[email protected]> wrote:
[...]
It's deliberate, and documented:
https://senders.yahooinc.com/smtp-error-codes/#unresolvable-from-domain
Hello
After my test, the subdomain e.mail.de can delivery messages to yahoo.com.
And, e.mail.de has no soa RR as well.
$ dig e.mail.de soa +short
gets nothing.
I am guessing yahoo is blocking the specified subdomains, not all.
As a comparision, I sent another mail from my alumni email, alumni.nd.edu.
This is a real zone, has soa defined.
$ dig alumni.nd.edu soa +short
ns1.nd.edu. dns.nd.edu. 209 10800 3600 1209600 900
And the message was delivered to yahoo successfully.
Anyway yahoo should not reject a message only b/c its domain has no SOA.
regards,
Ken Peng
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