On 2023-05-06 at 18:44 +0200, Christian Seitz via mailop wrote: > If I am not wrong a DNS zone can only have a single SOA record. Yahoo > requests > an SOA record per subdomain. That does not make any sense to me. We > would have > to create one DNS zone per subdomain, but that's not how DNS is > designed. > > Am I completely wrong? What did I miss? Is this a mistake somebody > who doesn't > know much about DNS defined as a requirement or is this just another > "we are > big so we can request whatever we want and whatever makes your life > hard" thing?
You could probably do some hackish delegation to get a SOA per subdomain, but such requirement makes no sense. First, if they really wanted to restrict email domains they accept to the ones that are registered, rather than looking for a SOA they should be using the PSL, where in-berlin.de has been for years [1]. And second, such policy would still be broken. While email addresses _generally_ use the primary domain, email addresses not on a second level domain have been used for as long as there have been subdomains. RFC 5321 itself contains an example of that, although references to such usage can be found many years back (e.g. RFC 974). It is relatively common to find that pattern of "subdomain emails" in Universities, with email domains linked to the different departments. It is also very common to have "alumni emails" that use a subdomain of the main university domain [2,3,4,5] None of those would now be able to email yahoo accounts, apparently. I find it hard to believe that they may have added such restriction on purpose. It may be that a check inadvertently added a dependency on th domain part of the email address having a SOA record. Or even that their statement that they now require a SOA was actually wrong and your issue slightly different. There are several Yahoo people on the list. I'm sure they will investigate what's really going on. Regards 1- https://github.com/publicsuffix/list/pull/711 2- https://alumni.stanford.edu/perks/email/ 3- https://alumniemail.ud.purdue.edu/ 4- https://www.alumni.columbia.edu/content/alumni-email 5- https://www.thecrimson.com/article/2023/5/5/haa-retains-alumni-emails/ _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
