For linux-kernel I find:
linux-kernel+unsubscribe@xxxxxxxxxxxxxxx
I wrote two o three times, but nothing happens. I don't get any error oro
bounce messages. Simply, it doesn't work: I continue to receive messages.
I see your unsubscription requests and I can see that we send a confirmation
message to you. Can you please check all of your folders? The subject is
"Confirm unsubscribe from linux-kernel@xxxxxxxxxxxxxxx".
I wrote also to postmaster@xxxxxxxxxxxxxxx, but got no answer.
It's holidays. :)