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> this example has cleared up for me why gmail does such stupidity,
> sadly they were misleading and claimed the spam classification was due
> to "similar to other spam".
> 
> i can confirm that most of the incorrectly classified spam messages i
> get in gmail seem to have dmarc not set to none.
> i checked a few exemplary senders, one of which being a web forum with
> quite a few messages every day.
> 
> gmail itself also has it's dmarc set to none.
> 
> so while gmail wants to force you to use dmarc (unverified, somebody
> claimed that on irc once) they don't seem to think anybody should have
> to act upon it in any way ;)

I'll pile on and summarize the discussion from cat-v
earlier today:

Kvik's email was being shitcanned on gmail because
of his dkim conflicting with our munging. Dkim signs
headers that it expects anyone forwarding mail to
leave untouched. Kvik's list was excessive, but most
dkim configs will be unhappy with our rewrites, since
they want the subject left untouched.

That leaves us 3 options:

	1. Strip out DKIM entirely from forwarded emails.
	2. Don't mess with any headers we don't need to
	3. Implement DKIM, munge to our heart's content,
	   and re-sign.

My vote is in favor of 2 right now, and maybe 3 if we
ever implement dkim in upas.

This seems like a good summary of the situation.

	https://begriffs.com/posts/2018-09-18-dmarc-mailing-list.html

For reference, the headers gmail doesn't want us to touch are:

	mime-version:in-reply-to:references:from:date:message-id:subject:to;

Not sure what the other big providers want.