Re: [mailop] AOL/Yahoo requiring SOA record for MAIL FROM domain name?

[Felix Fontein via mailop]

Hi,

> > the conclusions at that time were:
> > [...] > - It only affects domains on the Public Suffix List. i.e.
> > the sender domain is in some public namespace where Y! want to see
> > an SOA to show it's actually administered by someone.
> > 
> > Is that the case for you?  
> 
> No. I might as well reveal the actual domain names involved, since
> it's not particularly secret: it's "westfir.or.us" and
> "ci.westfir.or.us".
> 
> Neither of those are on the public suffix list, although "or.us" is.
> 
> Mail from *@ci.westfir.or.us is accepted if ci.westfir.or.us has an
> SOA record, and not accepted if it doesn't.
> 
> So if it's supposed to be only checking at delegated breakpoints on
> the PSL, it appears it has a bug, because there's no break between
> those two (unless I'm missing something obvious)?

right now there is only a SOA record for `us.` itself and for
`ci.westfir.or.us.`, but for nothing inbetween. Since both `us.` and
`or.us.` are public suffixes, Y! seems to expect a SOA record
somewhere below these two, so for `westfir.or.us.` or
`ci.westfir.or.us.` (or both).

Cheers,
Felix

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Re: [mailop] Yahoo: SOA record per subdomain required?!

[Felix Fontein via mailop]

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  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"
> >  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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