I'll note in passing that there is a long, long history of Yahoo email addresses getting bounce-blocked on Mailman that has to do with the Yahoo configuration; in the past, even including the list's email address as a direct contact wasn't always enough for Yahoo to stop bouncing.  I hope that this problem isn't repeating itself, but you might want to suggest to the user to add the list's email address to their recognized contact list. 

Risker/Anne

On Tue, 6 Jul 2021 at 14:31, Kunal Mehta <legoktm@debian.org> wrote:
Hi Szymon,

On 7/5/21 1:30 PM, Szymon Grabarczuk wrote:
> What should I do?
>
> More info on the list's settings:
>
>   * I've checked the individual settings of their subscription, and
>     it's"delivery status -> enabled".

If they set it back to "enabled", there should be nothing else to do. If
they're still having trouble please send me the list name and email
address offlist and I can look with more detail in case there's anything
else.

-- Kunal
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