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Re: [Bimi] Affiliation Bias (was: Re: Thoughts about MUA/BIMI)

Dave Crocker <dhc@dcrocker.net> Fri, 12 August 2022 15:37 UTC

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Date: Fri, 12 Aug 2022 08:37:21 -0700
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To: Todd Herr <todd.herr=40valimail.com@dmarc.ietf.org>, "BIMI (IETF) (bimi@ietf.org)" <bimi@ietf.org>
References: <MN2PR11MB435138DB4A7161A506B8CD25F7649@MN2PR11MB4351.namprd11.prod.outlook.com> <CAHej_8=dJBgSqKaFuOoOs4mqwKUEHdwVthTn0CRx+=1O5gm2iQ@mail.gmail.com> <ca56da5e-5685-8a04-70c5-0a1ee53a1e79@dcrocker.net> <CAHej_8=MPYLXE0kMnte-9+Z1gS+RF-965CTaBeJq4PxknvYOVQ@mail.gmail.com>
From: Dave Crocker <dhc@dcrocker.net>
Organization: Brandenburg InternetWorking
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Subject: Re: [Bimi] Affiliation Bias (was: Re: Thoughts about MUA/BIMI)
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On 8/12/2022 8:27 AM, Todd Herr wrote:
> including ones that don't participate in BIMI. If the details for 
> attaching a BIMI result, etc., are indeed standardized, it's not 
> inconceivable for an abuser to send messages containing forged results 
> to MBPs that don't participate in BIMI, and since those MBPs aren't 
> participating in BIMI, they won't perform the necessary sanitation of 
> the message to remove the forged results, and now the MUA is showing 
> its user logos that it shouldn't show

Indeed.

This merely means that the trust model needs to include an explicit 
assertion by a platform provider, to the unaffiliated MUA, that it 
supports and enforces Bimi.  That is, an assertion that mail it 
transfers to the MUA and that contains a Bimi marketing image has been 
vetted by the platform provider.

The MUA then removes Bimi marketing images from mail transfered by a 
platform provider that has not declared Bimi vetting.

Whether the MUA chooses to trust images from a platform provider that 
/does/ declare Bimi vetting is a distinct matter of platform reputation...

d/

-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net

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