Hi, maybe this is related to in-berlin.de being on the Public Suffix List? This might explain why Yahoo treats subdomains of in-berlin.de differently than for subdomains of other domains (like e.mail.de mentioned by Ken).
Cheers, Felix On Sun, 7 May 2023 12:27:21 +0200 Carsten Schiefner via mailop <[email protected]> wrote: > 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 _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
