[EM] Missing messages (was: Re: Should we allow "voting off" this mailing list?)

[Toby Pereira]

 Since your comeback, your messages have gone into my spam folder. The messages from Kevin and Chris I don't see at all though!
Toby
    On Tuesday 23 July 2024 at 23:48:54 BST, Kristofer Munsterhjelm <km-elmet at munsterhjelm.no> wrote:  
 
 On 2024-07-23 23:06, Toby Pereira wrote:
> I don't see most messages from Chris Benham or Kevin Venzke. I think it 
> might be something to do with us all using Yahoo, but you aren't so 
> there might be something else going on there.

I think that's due to different ISPs having different DMARC policies.

After some web browsing, I found the following explanation:

> There are three essential DMARC policy options: "none," "quarantine," and "reject".
> 
> - The "none" policy, also known as "monitor" tells the provider to
>  take no action.
> - The "quarantine" policy sends any unauthorized emails into a
>  separate folder, similar to a spam folder.
> - The "reject" policy tells the provider to block any unauthorized
>  emails so that they cannot reach recipients.

These tell the receiving mail host what to do if the DMARC check fails. 
They're set by DNS. For instance, for Yahoo:

$ dig -t TXT _DMARC.yahoo.co.uk
(...)
;; ANSWER SECTION:
_DMARC.yahoo.co.uk.    1800    IN    TXT    "v=DMARC1; p=reject; pct=100; 
rua=mailto:d at rua.agari.com; ruf=mailto:d at ruf.agari.com;"

p=reject sets the policy for any mails claiming to be from yahoo.co.uk 
to "reject". So the recipient should just delete them if they fail the 
DMARC check (as far as I understand). Fortunately for me, my provider 
just adds a penalty of 10 instead.

My own provider sets "p=quarantine". If Yahoo follows the policies 
literally, that should put my EM posts in your (Toby's) spam folder.

-km
  
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