Re: [PATCH v4 0/2] media: usb: pwc: Don't use coherent DMA buffers for ISO transfer

From: Matwey V. Kornilov
Date: Fri Aug 10 2018 - 04:29:17 EST

Hi Linus,

Thanks for pointing it out, I'll try to do my best to avoid this in future.

As I see now, in my case, the 'sender' in DKIM is triggered when using
GMail with alien domain in "Send From:".
I would not say that it is configuration "bug" (at least I can imagine
why do they do that), but it definitely must be avoided for maillists.
It is also interesting that if I use alien "From" email address with
google-apps (g suite) domain, then GMail generated two DKIM-Signature
headers, both for and for the google-apps domain.

2018-08-09 22:31 GMT+03:00 Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>:
> Matwey,
> your DKIM signature is garbage, and it causes your emails to be
> marked as spam when they go through a mailing list.
> The reason is this:
> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
>; s=20161025;
> h=sender:from:to:cc:subject:date:message-id;
> where the problem is that the "sender" field is included in the DKIM
> hash calculation.
> That is completely incorrect, since a mailing list will - by
> definition - change the sender to the list, not the original sender.
> This is not a mailing list bug. This is a bug in your DKIM setup on
> the sending side.
> I'm leaving everybody cc'd., because this problem is starting to be
> annoyingly common. We had two people with addresses with
> the same misconfiguration, and I want people to be aware of this.
> I get too much email, and too much spam, and so when people have
> misc-onfigured email sending that causes problems for spam systems, it
> needs to get fixed.
> Your situation *may* be the same as the Chromium guys. Quoting Doug:
> "Looks like it's all fixed. Both Kees and I setup our
> accounts a long time ago. IIRC during that time the suggested way to
> do things was that you'd use your SMTP settings even when
> you were sending as your account. These days it
> doesn't appear that there's even any UI in gmail to configure things
> that way, so presumably nobody else will be stuck in the same hole
> that Kees and I were in"
> and he may have been wrong about that "presumably nobody else will be
> stuck in the same hole" guess.
> So you might want to check what the SMTP settings are for your setup.
> Linus

With best regards,
Matwey V. Kornilov