Incorrect response address when using B4

[Konstantin Ryabitsev]

On Tue, Oct 01, 2024 at 11:26:12AM GMT, Jani Nikula wrote:
> - In all cases, the "From:" field SHOULD NOT contain any mailbox that
>   does not belong to the author(s) of the message. [1]

Well, the author of the message is not the original sender, but the relay
service -- so this is still true.

> I assume b4 is not using your address in From: because it's very likely
> to get the email classified as spam due to From: spoofing. Worse, it
> might get kernel.org on spam sender lists.

It's not just spam classification -- this is literally the only way to make
DMARC work. We can only send messages from domains we control, so to relay
patches coming from origins that we don't control we necessarily rewrite the
From: address (and put it into the body of the message, as git expects).

-K