> On 07.05.2023 at 21:55 Bill Cole via mailop wrote: > > On 2023-05-07 at 15:12:54 UTC-0400 (Sun, 7 May 2023 19:12:54 +0000) > Gellner, Oliver via mailop <[email protected]> > is rumored to have said: > >> While I’m not affiliated with Yahoo, I see no reason to bash them in this >> regard. To reduce spam they don’t want to accept emails from made-up / >> non-existing domains, which is a legit concern. They query for SOA records >> to verify whether a given domain exists, which is unusual but actually less >> strict than requiring additional A or MX records. > > How so? > > A SOA is unrelated to email operationally. A name MUST have either an MX > record or an A record (does anyone do AAAA fallback?) to work as the domain > part of an email address. Without one of those, an address is by definition > undeliverable. The SOA record is all administrative detail; the only truly > critical content is the serial number and that is only critical to caching > resolvers.
If a receiver only accepts emails from sender addressed domains for which MX or A records exist (such checks are performed by many receiving servers), it means a sender has to 1. set up a DNS zone and 2. create a MX or A record within it. Whereas if a receiver only checks for the SOA record of the organizational domain of the sender address, creating a DNS zone is enough and step 2. is not necessary. Thats what I meant by „actually less strict“, although the difference is of course negligible. — BR Oliver ________________________________ dmTECH GmbH Am dm-Platz 1, 76227 Karlsruhe * Postfach 10 02 34, 76232 Karlsruhe Telefon 0721 5592-2500 Telefax 0721 5592-2777 [email protected]<mailto:[email protected]> * www.dmTECH.de<http://www.dmtech.de> GmbH: Sitz Karlsruhe, Registergericht Mannheim, HRB 104927 Geschäftsführer: Christoph Werner, Martin Dallmeier, Roman Melcher ________________________________ Datenschutzrechtliche Informationen Wenn Sie mit uns in Kontakt treten, beispielsweise wenn Sie an unser ServiceCenter Fragen haben, bei uns einkaufen oder unser dialogicum in Karlsruhe besuchen, mit uns in einer geschäftlichen Verbindung stehen oder sich bei uns bewerben, verarbeiten wir personenbezogene Daten. Informationen unter anderem zu den konkreten Datenverarbeitungen, Löschfristen, Ihren Rechten sowie die Kontaktdaten unserer Datenschutzbeauftragten finden Sie hier<https://www.dm.de/datenschutzerklaerung-kommunikation-mit-externen-493832>. _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
