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From: Jakub Olexa <jakub@mailkit.com>
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Subject: Re: [Bimi] What if DKIM doesn't validate the selector header.
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Hi Alex,

sorry for the late response. I was thinking about this a lot and here=20
are my thoughts:

a) the selector header really needs to be secure and therefore DKIM=20
signed and the DMARC must pass. Otherwise a third party may find an=20
abuse vector by relying on a fallback to default selector which may be=20
deceptive. In short - there should not be a fallback to default - there=20
was a clear intent in specifying the selector and that intent should be=20
honored as much as possible.

b) If there is a trusted ARC signature the message and the selector used =

should be trusted as well.

While I believe marketers would prefer the fallback to default selector=20
if the specified selector fails, I'm also worried it may open doors to=20
DKIM replay attacks to get the BIMI displayed.

Jakub Olexa
Founder & CEO
E-mail: jakub@mailkit.com <mailto:jakub@mailkit.com>
Tel: +420 777 744 440 <tel:+420777744440>

Mailkit - Closing the circle between Deliverability and Engagement=20
<https://www.mailkit.com>

On 06.05.2021 15:19, Brotman, Alex wrote:
>
> Jakub,
>
> Are you suggesting that in order to use an alternate selector (beyond=20
> default._bimi.sub.example.com or similar default) that it MUST be=20
> DKIM-signed, and MUST align in the DMARC-sense?=C2=A0 I could see that =
as=20
> being reasonable. Let=E2=80=99s say this happens.=C2=A0 If DKIM (which =
originally=20
> signed the header and was properly aligned) is mangled during=20
> forwarding, and ARC is properly validated, is that also acceptable to=20
> use an specified selector?
>
> I=E2=80=99m also not sure it answers the original question (if DKIM fai=
ls, and=20
> there=E2=80=99s a selector, should the evaluator fallback to default._b=
imi,=20
> assuming SPF/DMARC pass/align).
>
> --
>
> Alex Brotman
>
> Sr. Engineer, Anti-Abuse & Messaging Policy
>
> Comcast
>
> *From:* bimi <bimi-bounces@ietf.org> *On Behalf Of * Jakub Olexa
> *Sent:* Friday, April 30, 2021 2:44 AM
> *To:* bimi@ietf.org
> *Subject:* Re: [Bimi] What if DKIM doesn't validate the selector header=
=2E
>
> If the logic relies only on DMARC authenticating rather than DKIM pass =

> then what is the abuse risk if the BIMI-Selector header is unsigned?=20
> You trust the source domain, the BIMI record comes from that "trusted=20
> source" and there was a clear intent from the sender for a specific=20
> selector. I'd suggest a binary choice here - either MUST or no=20
> signature requirement for the selector at all.
>
> *Jakub Olexa**
> *Founder & CEO*
> *E-mail: jakub@mailkit.com <mailto:jakub@mailkit.com>*
> *Tel: +420 777 744 440 <tel:+420777744440>*
>
> Mailkit - Closing the circle between Deliverability and Engagement=20
> <https://urldefense.com/v3/__https:/www.mailkit.com__;!!CQl3mcHX2A!TfLC=
VUwlA6N-UmGBdsTK83EMJ7Y6e0vZDbakmAadQBUEukVeKNUlVVb2aYdaT6t7iKs5acU$>=20
> *
>
> On 30.04.2021 3:33, Marc Bradshaw wrote:
>
>     Hi,
>
>     I see what you are saying, this is the section...
>
>     If present, the BIMI-Selector header SHOULD be included in the
>     DMARC-aligned
>
>     DKIM signature used to confirm authenticity of the message.=C2=A0 I=
f it
>     is not
>
>     included in the DMARC-compliant DKIM signature, the header SHOULD
>     be ignored.
>
>     In the absence of a clear statement of what should happen if the
>     BIMI-Selector is included in a failing DKIM signature I had read
>     (and implemented) this as ignoring this header unless it has a
>     valid DKIM signature, but not considering a failed signature as a
>     blocker if DMARC passes for some other reason, either SPF, or the
>     presence of a second passing DKIM signature for the same domain.
>
>     I propose the modification of this section to state that failing
>     DKIM signatures SHOULD be ignored, but BIMI processing SHOULD
>     continue.
>
>     The use of SHOULD in this section was intended to cover the cases
>     where MBPs did not implement this check, however I would be happy
>     to make these checks a MUST, what is the opinion of the group?
>
>     On Fri, 30 Apr 2021, at 1:45 AM, Zack Aab wrote:
>
>         Hi,
>
>         >Seems more a question about should a receiver go to
>         default._bimi (or something else) if the selector is specified
>         but seems unusable (either not signed or signature fails).
>
>         This is it exactly.=C2=A0 Maybe I missed something, but as writ=
ten
>         there is no suggested or required action if the receiver sees
>         that the BIMI-selector is DKIM signed but that DKIM fails to
>         validate.=C2=A0 This can probably be covered with one line in
>         section 5.4, it's just a question of "should the receiver skip
>         to default._bimi. or skip BIMI entirely?"
>
>         Thanks!
>
>         *Zack Aab*(He/Him)
>         Senior Consultant, Trendline Interactive
>         *O* +1 (512) 717-4097 <tel:+15127174097> | *C* +1 (404)
>         317-6729 <tel:+14043176729> | *W* trendlinei.com
>         <https://urldefense.com/v3/__https:/www.trendlineinteractive.co=
m/__;!!CQl3mcHX2A!TfLCVUwlA6N-UmGBdsTK83EMJ7Y6e0vZDbakmAadQBUEukVeKNUlVVb=
2aYdaT6t72RIcDAo$>
>
>         On Thu, Apr 29, 2021 at 11:19 AM Brotman, Alex
>         <Alex_Brotman=3D40comcast.com@dmarc.ietf.org
>         <mailto:40comcast.com@dmarc.ietf.org>> wrote:
>
>             I=E2=80=99m not entirely sure that answers the original que=
stion.=C2=A0
>             I don=E2=80=99t think the OP is an attempt to second guess =
DMARC.
>             Seems more a question about should a receiver go to
>             default._bimi (or something else) if the selector is
>             specified but seems unusable (either not signed or
>             signature fails).=C2=A0 If we believe the sections A.1/A.5
>             covers this scenario, perhaps we just need a little
>             embellishment on this scenario below to be more explicit.=C2=
=A0
>             And yes, local policy can impact this.
>
>             --
>
>             Alex Brotman
>
>             Sr. Engineer, Anti-Abuse & Messaging Policy
>
>             Comcast
>
>             *From:* bimi <bimi-bounces@ietf.org
>             <mailto:bimi-bounces@ietf.org>> *On Behalf Of *Marc Bradsha=
w
>
>             *Sent:* Thursday, April 29, 2021 2:56 AM
>
>             *To:* bimi@ietf.org <mailto:bimi@ietf.org>
>
>             *Subject:* Re: [Bimi] What if DKIM doesn't validate the
>             selector header.
>
>             Hi,
>
>             Opinion: This feels like a discussion outside the scope of
>             BIMI, SPF forgery is a known issue ref the recent
>             Multipass attack at a well known vendor. There is a
>             related note in the "Unsigned BIMI-Selector Header"
>             section of the spec.
>
>             We do see senders with p=3Dreject who rely entirely on SPF
>             and do not DKIM sign at all, I would argue that the
>             problem being described here is more about vulnerabilities
>             in some shared infrastructure platforms and not about how
>             BIMI should be implemented. At the very least, I would
>             expect that discussion to take place in the DMARC group,
>             and that BIMI should take the DMARC result as is as much
>             as is possible, without imposing additional constraints
>             over what constitutes a valid DMARC pass or fail.
>
>             MBPs are, of course, free to implement whatever additional
>             constraints they see fit, but I don't feel that this one
>             belongs in BIMI.
>
>             On Thu, 29 Apr 2021, at 4:26 PM, Jakub Olexa wrote:
>
>                 Hi,
>
>                 In my opinion if DKIM fails to validate the message
>                 content the MBP should not display the BIMI at all (no
>                 matter why the DKIM failed). The reasoning for this is
>                 that SPFs validate shared infrastructures (OL365,
>                 GSuite, etc) and as such domains can be spoofed while
>                 DKIM authenticates the actual content. BIMI logos
>                 being displayed on the message list (see Yahoo mail
>                 app) they become sort of a "From" indicator from the
>                 users perspective and over time will become sort of a
>                 trust indicator. BIMI should make every effort on the
>                 standard level to discourage any use of BIMI that
>                 failed a critical validation of the message body as
>                 that alone could be an abuse vector.
>
>                 If a phishing operation targets businesses that are
>                 using shared infrastructures and have BIMI, they could
>                 achieve quite a significant success if the messages
>                 get highlighted with a logo while failing DKIM. This
>                 would undermine BIMI in a major way and DKIM as well.
>
>                 Jakub Olexa
>
>                 Founder & CEO
>
>                 E-mail: jakub@mailkit.com <mailto:jakub@mailkit.com>
>
>                 Tel: +420 777 744 440 <tel:+420777744440>
>
>                 *Mailkit - *Closing the circle between Deliverability
>                 and Engagement
>                 <https://urldefense.com/v3/__https:/www.mailkit.com__;!=
!CQl3mcHX2A!WQ-21HMjp9kg9GakwBT_pAPcHXM38K2yUd_r1iIZYfE97a34wAqfUMixJXuGc=
n3A1DGUptw$>
>
>                 On 28.04.2021 22:06, Zack Aab wrote:
>
>                     I was reading section 5.4 of the document and it's
>                     pretty clear what to do if the selector header
>                     (BIMI-selector) is not included in the
>                     DMARC-aligned DKIM signature: treat it as if there
>                     is no selector header and move on to default._bimi.=

>
>                     BUT
>
>                     What if the DKIM signature includes the
>                     BIMI-selector header but doesn't pass validation
>                     AND DMARC still passes via SPF?
>
>                     It seems to me (given DKIM's normal use - a broken
>                     signature should be treated as not having a
>                     signature) that the receiver should treat the
>                     BIMI-selector header as unsigned and move on to
>                     default._bimi, but it's not actually stated one
>                     way or the other, so the response from the
>                     receiver could be to stop BIMI validation entirely.=

>
>                     *Zack Aab*(He/Him)
>                     Senior Consultant, Trendline Interactive
>                     *O* +1 (512) 717-4097 <tel:+15127174097> | *C* +1
>                     (404) 317-6729 <tel:+14043176729> | *W*
>                     trendlinei.com
>                     <https://urldefense.com/v3/__https:/www.trendlinein=
teractive.com/__;!!CQl3mcHX2A!WQ-21HMjp9kg9GakwBT_pAPcHXM38K2yUd_r1iIZYfE=
97a34wAqfUMixJXuGcn3A2tiXW_Y$>
>
>                 --=20
>
>                 bimi mailing list
>
>                 bimi@ietf.org <mailto:bimi%40ietf.org>
>
>                 https://www.ietf.org/mailman/listinfo/bimi
>                 <https://urldefense.com/v3/__https:/www.ietf.org/mailma=
n/listinfo/bimi__;!!CQl3mcHX2A!WQ-21HMjp9kg9GakwBT_pAPcHXM38K2yUd_r1iIZYf=
E97a34wAqfUMixJXuGcn3A3P4VcGQ$>
>
>             --
>
>             =09
>
>             =C2=A0 Marc Bradshaw
>
>             marcbradshaw.net
>             <https://urldefense.com/v3/__http:/marcbradshaw.net/__;!!CQ=
l3mcHX2A!WQ-21HMjp9kg9GakwBT_pAPcHXM38K2yUd_r1iIZYfE97a34wAqfUMixJXuGcn3A=
jv1deoc$>
>             | @marcbradshaw
>             <https://urldefense.com/v3/__https:/twitter.com/marcbradsha=
w__;!!CQl3mcHX2A!WQ-21HMjp9kg9GakwBT_pAPcHXM38K2yUd_r1iIZYfE97a34wAqfUMix=
JXuGcn3AYnziQXA$>
>
>             --=20
>
>             bimi mailing list
>
>             bimi@ietf.org <mailto:bimi@ietf.org>
>
>             https://www.ietf.org/mailman/listinfo/bimi
>             <https://urldefense.com/v3/__https:/www.ietf.org/mailman/li=
stinfo/bimi__;!!CQl3mcHX2A!TfLCVUwlA6N-UmGBdsTK83EMJ7Y6e0vZDbakmAadQBUEuk=
VeKNUlVVb2aYdaT6t7tmtMhfg$>
>
>         --=20
>
>         bimi mailing list
>
>         bimi@ietf.org <mailto:bimi%40ietf.org>
>
>         https://www.ietf.org/mailman/listinfo/bimi
>         <https://urldefense.com/v3/__https:/www.ietf.org/mailman/listin=
fo/bimi__;!!CQl3mcHX2A!TfLCVUwlA6N-UmGBdsTK83EMJ7Y6e0vZDbakmAadQBUEukVeKN=
UlVVb2aYdaT6t7tmtMhfg$>
>
>     --
>
>     =09
>
>     =C2=A0 Marc Bradshaw
>
>     marcbradshaw.net
>     <https://urldefense.com/v3/__http:/marcbradshaw.net/__;!!CQl3mcHX2A=
!TfLCVUwlA6N-UmGBdsTK83EMJ7Y6e0vZDbakmAadQBUEukVeKNUlVVb2aYdaT6t79NtKVsQ$=
>
>     | @marcbradshaw
>     <https://urldefense.com/v3/__https:/twitter.com/marcbradshaw__;!!CQ=
l3mcHX2A!TfLCVUwlA6N-UmGBdsTK83EMJ7Y6e0vZDbakmAadQBUEukVeKNUlVVb2aYdaT6t7=
bCbWKL8$>
>
>
>

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    <p>Hi Alex,</p>
    <p>sorry for the late response. I was thinking about this a lot and
      here are my thoughts:</p>
    <p>a) the selector header really needs to be secure and therefore
      DKIM signed and the DMARC must pass. Otherwise a third party may
      find an abuse vector by relying on a fallback to default selector
      which may be deceptive. In short - there should not be a fallback
      to default - there was a clear intent in specifying the selector
      and that intent should be honored as much as possible.<br>
    </p>
    <p>b) If there is a trusted ARC signature the message and the
      selector used should be trusted as well.</p>
    <p>While I believe marketers would prefer the fallback to default
      selector if the specified selector fails, I'm also worried it may
      open doors to DKIM replay attacks to get the BIMI displayed.<br>
    </p>
    <div class=3D"moz-signature">
      <p style=3D"font-family:Calibri,Tahoma, Geneva,
        sans-serif;font-weight:bold; color: #000000;font-size:13pt">
        <span style=3D"letter-spacing:2px;">Jakub Olexa</span><br>
        <span style=3D"font-size:10pt; font-weight:normal;color:#666666">=
Founder
          &amp; CEO</span><br>
        <span style=3D"font-size:10pt; font-weight:normal;color:#666666">=
E-mail:
          <a href=3D"mailto:jakub@mailkit.com" style=3D"text-decoration:n=
one
            !important; color:#000000 !important" target=3D"_blank">jakub=
@mailkit.com</a></span><br>
        <span style=3D"font-size:10pt; font-weight:normal;color:#666666">=
Tel:
          <a href=3D"tel:+420777744440" style=3D"text-decoration:none
            !important; color:#000000 !important" target=3D"_blank">+420
            777 744 440</a></span>
        <br>
        <br>
        <a style=3D"font-size:11pt; font-weight:bold; color: #000000
          !important; text-decoration:none !important"
          href=3D"https://www.mailkit.com" target=3D"_blank">Mailkit - <s=
pan
            style=3D"font-size:10pt; font-weight:normal; color:#9a0307
            !important;">Closing the circle between Deliverability and
            Engagement</span></a>
      </p>
    </div>
    <div class=3D"moz-cite-prefix">On 06.05.2021 15:19, Brotman, Alex
      wrote:<br>
    </div>
    <blockquote type=3D"cite"
cite=3D"mid:MN2PR11MB43510D2EED7F4700E5B314A6F7589@MN2PR11MB4351.namprd11=
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      <div class=3D"WordSection1">
        <p class=3D"MsoNormal">Jakub,<o:p></o:p></p>
        <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p>
        <p class=3D"MsoNormal">Are you suggesting that in order to use an=

          alternate selector (beyond default._bimi.sub.example.com or
          similar default) that it MUST be DKIM-signed, and MUST align
          in the DMARC-sense?=C2=A0 I could see that as being reasonable.=
=C2=A0
          Let=E2=80=99s say this happens.=C2=A0 If DKIM (which originally=
 signed the
          header and was properly aligned) is mangled during forwarding,
          and ARC is properly validated, is that also acceptable to use
          an specified selector?<o:p></o:p></p>
        <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p>
        <p class=3D"MsoNormal">I=E2=80=99m also not sure it answers the o=
riginal
          question (if DKIM fails, and there=E2=80=99s a selector, should=
 the
          evaluator fallback to default._bimi, assuming SPF/DMARC
          pass/align).<o:p></o:p></p>
        <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p>
        <div>
          <p class=3D"MsoNormal">--<o:p></o:p></p>
          <p class=3D"MsoNormal">Alex Brotman<o:p></o:p></p>
          <p class=3D"MsoNormal">Sr. Engineer, Anti-Abuse &amp; Messaging=

            Policy<o:p></o:p></p>
          <p class=3D"MsoNormal">Comcast<o:p></o:p></p>
        </div>
        <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p>
        <div style=3D"border:none;border-left:solid blue 1.5pt;padding:0i=
n
          0in 0in 4.0pt">
          <div>
            <div style=3D"border:none;border-top:solid #E1E1E1
              1.0pt;padding:3.0pt 0in 0in 0in">
              <p class=3D"MsoNormal"><b>From:</b> bimi
                <a class=3D"moz-txt-link-rfc2396E" href=3D"mailto:bimi-bo=
unces@ietf.org">&lt;bimi-bounces@ietf.org&gt;</a> <b>On Behalf Of </b>
                Jakub Olexa<br>
                <b>Sent:</b> Friday, April 30, 2021 2:44 AM<br>
                <b>To:</b> <a class=3D"moz-txt-link-abbreviated" href=3D"=
mailto:bimi@ietf.org">bimi@ietf.org</a><br>
                <b>Subject:</b> Re: [Bimi] What if DKIM doesn't validate
                the selector header.<o:p></o:p></p>
            </div>
          </div>
          <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p>
          <p>If the logic relies only on DMARC authenticating rather
            than DKIM pass then what is the abuse risk if the
            BIMI-Selector header is unsigned? You trust the source
            domain, the BIMI record comes from that "trusted source" and
            there was a clear intent from the sender for a specific
            selector. I'd suggest a binary choice here - either MUST or
            no signature requirement for the selector at all.<o:p></o:p><=
/p>
          <div>
            <p><b><span
                  style=3D"font-size:13.0pt;color:black;letter-spacing:1.=
5pt">Jakub
                  Olexa</span></b><b><span
                  style=3D"font-size:13.0pt;color:black"><br>
                </span></b><span style=3D"font-size:10.0pt;color:#666666"=
>Founder
                &amp; CEO</span><b><span
                  style=3D"font-size:13.0pt;color:black"><br>
                </span></b><span style=3D"font-size:10.0pt;color:#666666"=
>E-mail:
                <a href=3D"mailto:jakub@mailkit.com" target=3D"_blank"
                  moz-do-not-send=3D"true">
                  jakub@mailkit.com</a></span><b><span
                  style=3D"font-size:13.0pt;color:black"><br>
                </span></b><span style=3D"font-size:10.0pt;color:#666666"=
>Tel:
                <a href=3D"tel:+420777744440" target=3D"_blank"
                  moz-do-not-send=3D"true">
                  +420 777 744 440</a></span><b><span
                  style=3D"font-size:13.0pt;color:black"> <br>
                  <br>
                  <a
href=3D"https://urldefense.com/v3/__https:/www.mailkit.com__;!!CQl3mcHX2A=
!TfLCVUwlA6N-UmGBdsTK83EMJ7Y6e0vZDbakmAadQBUEukVeKNUlVVb2aYdaT6t7iKs5acU$=
"
                    target=3D"_blank" moz-do-not-send=3D"true"><span
                      style=3D"font-size:11.0pt">Mailkit -
                    </span><span
                      style=3D"font-size:10.0pt;font-weight:normal">Closi=
ng
                      the circle between Deliverability and Engagement</s=
pan></a>
                  <o:p></o:p></span></b></p>
          </div>
          <div>
            <p class=3D"MsoNormal">On 30.04.2021 3:33, Marc Bradshaw
              wrote:<o:p></o:p></p>
          </div>
          <blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
            <div>
              <p class=3D"MsoNormal">Hi,<o:p></o:p></p>
            </div>
            <div>
              <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p>
            </div>
            <div>
              <p class=3D"MsoNormal">I see what you are saying, this is
                the section...<o:p></o:p></p>
            </div>
            <div>
              <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p>
            </div>
            <div>
              <p class=3D"MsoNormal">If present, the BIMI-Selector header=

                SHOULD be included in the DMARC-aligned<o:p></o:p></p>
            </div>
            <div>
              <p class=3D"MsoNormal">DKIM signature used to confirm
                authenticity of the message.=C2=A0 If it is not<o:p></o:p=
></p>
            </div>
            <div>
              <p class=3D"MsoNormal">included in the DMARC-compliant DKIM=

                signature, the header SHOULD be ignored.<o:p></o:p></p>
            </div>
            <div>
              <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p>
            </div>
            <div>
              <p class=3D"MsoNormal">In the absence of a clear statement
                of what should happen if the BIMI-Selector is included
                in a failing DKIM signature I had read (and implemented)
                this as ignoring this header unless it has a valid DKIM
                signature, but not considering a failed signature as a
                blocker if DMARC passes for some other reason, either
                SPF, or the presence of a second passing DKIM signature
                for the same domain.<o:p></o:p></p>
            </div>
            <div>
              <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p>
            </div>
            <div>
              <p class=3D"MsoNormal">I propose the modification of this
                section to state that failing DKIM signatures SHOULD be
                ignored, but BIMI processing SHOULD continue.<o:p></o:p><=
/p>
            </div>
            <div>
              <p class=3D"MsoNormal">The use of SHOULD in this section wa=
s
                intended to cover the cases where MBPs did not implement
                this check, however I would be happy to make these
                checks a MUST, what is the opinion of the group?<o:p></o:=
p></p>
            </div>
            <div>
              <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p>
            </div>
            <div>
              <p class=3D"MsoNormal">On Fri, 30 Apr 2021, at 1:45 AM, Zac=
k
                Aab wrote:<o:p></o:p></p>
            </div>
            <blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt"
              id=3D"qt">
              <div>
                <div>
                  <p class=3D"MsoNormal">Hi,<o:p></o:p></p>
                </div>
                <div>
                  <p class=3D"MsoNormal">&gt;Seems more a question about
                    should a receiver go to default._bimi (or something
                    else) if the selector is specified but seems
                    unusable (either not signed or signature fails).<o:p>=
</o:p></p>
                </div>
                <div>
                  <p class=3D"MsoNormal">This is it exactly.=C2=A0 Maybe =
I
                    missed something, but as written there is no
                    suggested or required action if the receiver sees
                    that the BIMI-selector is DKIM signed but that DKIM
                    fails to validate.=C2=A0 This can probably be covered=

                    with one line in section 5.4, it's just a question
                    of "should the receiver skip to default._bimi. or
                    skip BIMI entirely?"<o:p></o:p></p>
                </div>
                <div>
                  <p class=3D"MsoNormal">Thanks!<o:p></o:p></p>
                </div>
                <div>
                  <div>
                    <div>
                      <div>
                        <p class=3D"MsoNormal"><span class=3D"size"><b><s=
pan
style=3D"font-size:7.5pt;font-family:&quot;Verdana&quot;,sans-serif">Zack=

                                Aab</span></b></span><span class=3D"size"=
><span
style=3D"font-size:7.5pt;font-family:&quot;Verdana&quot;,sans-serif">
                              (He/Him)</span></span><span
                            style=3D"font-size:7.5pt;font-family:&quot;Ve=
rdana&quot;,sans-serif"><br>
                            <span class=3D"size">Senior Consultant,
                              Trendline Interactive</span><br>
                            <span class=3D"size"><b>O</b> <a
                                href=3D"tel:+15127174097" target=3D"_blan=
k"
                                moz-do-not-send=3D"true">+1 (512) 717-409=
7</a>
                              |
                              <b>C</b> <a href=3D"tel:+14043176729"
                                target=3D"_blank" moz-do-not-send=3D"true=
">+1
                                (404) 317-6729</a> | <b>W</b>
                              <a
href=3D"https://urldefense.com/v3/__https:/www.trendlineinteractive.com/_=
_;!!CQl3mcHX2A!TfLCVUwlA6N-UmGBdsTK83EMJ7Y6e0vZDbakmAadQBUEukVeKNUlVVb2aY=
daT6t72RIcDAo$"
                                target=3D"_blank" moz-do-not-send=3D"true=
">
                                trendlinei.com</a></span></span><o:p></o:=
p></p>
                      </div>
                    </div>
                  </div>
                  <div>
                    <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p>
                  </div>
                </div>
              </div>
              <div>
                <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p>
              </div>
              <div>
                <div>
                  <p class=3D"MsoNormal">On Thu, Apr 29, 2021 at 11:19 AM=

                    Brotman, Alex &lt;Alex_Brotman=3D<a
                      href=3D"mailto:40comcast.com@dmarc.ietf.org"
                      moz-do-not-send=3D"true">40comcast.com@dmarc.ietf.o=
rg</a>&gt;
                    wrote:<o:p></o:p></p>
                </div>
                <blockquote style=3D"border:none;border-left:solid
                  windowtext 1.0pt;padding:0in 0in 0in
                  6.0pt;margin-left:4.8pt;margin-right:0in;border-left-co=
lor:rgb(204,
                  204, 204)">
                  <div>
                    <div>
                      <p class=3D"qt-msonormal">I=E2=80=99m not entirely =
sure that
                        answers the original question.=C2=A0 I don=E2=80=99=
t think
                        the OP is an attempt to second guess DMARC.
                        Seems more a question about should a receiver go
                        to default._bimi (or something else) if the
                        selector is specified but seems unusable (either
                        not signed or signature fails).=C2=A0 If we belie=
ve
                        the sections A.1/A.5 covers this scenario,
                        perhaps we just need a little embellishment on
                        this scenario below to be more explicit.=C2=A0 An=
d
                        yes, local policy can impact this.<o:p></o:p></p>=

                      <div>
                        <p class=3D"qt-msonormal">=C2=A0<o:p></o:p></p>
                        <p class=3D"qt-msonormal">--<o:p></o:p></p>
                        <p class=3D"qt-msonormal">Alex Brotman<o:p></o:p>=
</p>
                        <p class=3D"qt-msonormal">Sr. Engineer, Anti-Abus=
e
                          &amp; Messaging Policy<o:p></o:p></p>
                        <p class=3D"qt-msonormal">Comcast<o:p></o:p></p>
                      </div>
                      <p class=3D"qt-msonormal">=C2=A0<o:p></o:p></p>
                      <div style=3D"border:none;border-left:solid blue
                        1.5pt;padding:0in 0in 0in
4.0pt;border-top-color:currentcolor;border-right-color:currentcolor;borde=
r-bottom-color:currentcolor">
                        <div>
                          <div style=3D"border:none;border-top:solid
                            windowtext 1.0pt;padding:3.0pt 0in 0in
0in;border-right-color:currentcolor;border-bottom-color:currentcolor;bord=
er-left-color:currentcolor;border-top-color:rgb(225,
                            225,
                            225)">
                            <div>
                              <p class=3D"MsoNormal"><b>From:</b> bimi
                                &lt;<a
                                  href=3D"mailto:bimi-bounces@ietf.org"
                                  target=3D"_blank" moz-do-not-send=3D"tr=
ue">bimi-bounces@ietf.org</a>&gt;
                                <b>On Behalf Of </b>Marc Bradshaw<o:p></o=
:p></p>
                            </div>
                            <div>
                              <p class=3D"MsoNormal"><b>Sent:</b>
                                Thursday, April 29, 2021 2:56 AM<o:p></o:=
p></p>
                            </div>
                            <div>
                              <p class=3D"MsoNormal"><b>To:</b> <a
                                  href=3D"mailto:bimi@ietf.org"
                                  target=3D"_blank" moz-do-not-send=3D"tr=
ue">bimi@ietf.org</a><o:p></o:p></p>
                            </div>
                            <div>
                              <p class=3D"MsoNormal"><b>Subject:</b> Re:
                                [Bimi] What if DKIM doesn't validate the
                                selector header.<o:p></o:p></p>
                            </div>
                          </div>
                        </div>
                        <p class=3D"qt-msonormal">=C2=A0<o:p></o:p></p>
                        <div>
                          <p class=3D"qt-msonormal">Hi,<o:p></o:p></p>
                        </div>
                        <div>
                          <p class=3D"qt-msonormal">=C2=A0<o:p></o:p></p>=

                        </div>
                        <div>
                          <p class=3D"qt-msonormal">Opinion: This feels
                            like a discussion outside the scope of BIMI,
                            SPF forgery is a known issue ref the recent
                            Multipass attack at a well known vendor.
                            There is a related note in the "Unsigned
                            BIMI-Selector Header" section of the spec.<o:=
p></o:p></p>
                        </div>
                        <div>
                          <p class=3D"qt-msonormal">We do see senders wit=
h
                            p=3Dreject who rely entirely on SPF and do no=
t
                            DKIM sign at all, I would argue that the
                            problem being described here is more about
                            vulnerabilities in some shared
                            infrastructure platforms and not about how
                            BIMI should be implemented. At the very
                            least, I would expect that discussion to
                            take place in the DMARC group, and that BIMI
                            should take the DMARC result as is as much
                            as is possible, without imposing additional
                            constraints over what constitutes a valid
                            DMARC pass or fail.<o:p></o:p></p>
                        </div>
                        <div>
                          <p class=3D"qt-msonormal">MBPs are, of course,
                            free to implement whatever additional
                            constraints they see fit, but I don't feel
                            that this one belongs in BIMI.<o:p></o:p></p>=

                        </div>
                        <div>
                          <p class=3D"qt-msonormal">=C2=A0<o:p></o:p></p>=

                        </div>
                        <div>
                          <p class=3D"qt-msonormal">On Thu, 29 Apr 2021,
                            at 4:26 PM, Jakub Olexa wrote:<o:p></o:p></p>=

                        </div>
                        <blockquote
                          style=3D"margin-top:5.0pt;margin-bottom:5.0pt"
                          id=3D"qt-gmail-m_8781077135384541872qt">
                          <p>Hi,<o:p></o:p></p>
                          <p>In my opinion if DKIM fails to validate the
                            message content the MBP should not display
                            the BIMI at all (no matter why the DKIM
                            failed). The reasoning for this is that SPFs
                            validate shared infrastructures (OL365,
                            GSuite, etc) and as such domains can be
                            spoofed while DKIM authenticates the actual
                            content. BIMI logos being displayed on the
                            message list (see Yahoo mail app) they
                            become sort of a "From" indicator from the
                            users perspective and over time will become
                            sort of a trust indicator. BIMI should make
                            every effort on the standard level to
                            discourage any use of BIMI that failed a
                            critical validation of the message body as
                            that alone could be an abuse vector.<o:p></o:=
p></p>
                          <p>If a phishing operation targets businesses
                            that are using shared infrastructures and
                            have BIMI, they could achieve quite a
                            significant success if the messages get
                            highlighted with a logo while failing DKIM.
                            This would undermine BIMI in a major way and
                            DKIM as well.<o:p></o:p></p>
                          <div>
                            <div>
                              <p class=3D"qt-msonormal"><span
                                  style=3D"letter-spacing:1.5pt">Jakub
                                  Olexa</span><o:p></o:p></p>
                            </div>
                            <div>
                              <p class=3D"qt-msonormal"><span class=3D"si=
ze"><span
style=3D"font-size:10.0pt;color:#666666">Founder &amp; CEO</span></span><=
o:p></o:p></p>
                            </div>
                            <div>
                              <p class=3D"qt-msonormal"><span class=3D"si=
ze"><span
style=3D"font-size:10.0pt;color:#666666">E-mail:
                                    <a href=3D"mailto:jakub@mailkit.com"
                                      target=3D"_blank"
                                      moz-do-not-send=3D"true">jakub@mail=
kit.com</a></span></span><o:p></o:p></p>
                            </div>
                            <div>
                              <p class=3D"qt-msonormal"><span class=3D"si=
ze"><span
style=3D"font-size:10.0pt;color:#666666">Tel:
                                    <a href=3D"tel:+420777744440"
                                      target=3D"_blank"
                                      moz-do-not-send=3D"true">+420 777
                                      744 440</a></span></span> <o:p>
                                </o:p></p>
                            </div>
                            <div>
                              <p class=3D"qt-msonormal">=C2=A0<o:p></o:p>=
</p>
                            </div>
                            <div>
                              <p class=3D"qt-msonormal"><a
href=3D"https://urldefense.com/v3/__https:/www.mailkit.com__;!!CQl3mcHX2A=
!WQ-21HMjp9kg9GakwBT_pAPcHXM38K2yUd_r1iIZYfE97a34wAqfUMixJXuGcn3A1DGUptw$=
"
                                  target=3D"_blank" moz-do-not-send=3D"tr=
ue"><b>Mailkit
                                    -
                                  </b><span class=3D"size"><span
                                      style=3D"font-size:10.0pt">Closing
                                      the circle between Deliverability
                                      and Engagement</span></span></a><o:=
p></o:p></p>
                            </div>
                          </div>
                          <div>
                            <p class=3D"qt-msonormal">On 28.04.2021 22:06=
,
                              Zack Aab wrote:<o:p></o:p></p>
                          </div>
                          <blockquote
                            style=3D"margin-top:5.0pt;margin-bottom:5.0pt=
">
                            <div>
                              <div>
                                <p class=3D"qt-msonormal">I was reading
                                  section 5.4 of the document and it's
                                  pretty clear what to do if the
                                  selector header (BIMI-selector) is not
                                  included in the DMARC-aligned DKIM
                                  signature: treat it as if there is no
                                  selector header and move on to
                                  default._bimi.<o:p></o:p></p>
                              </div>
                              <div>
                                <p class=3D"qt-msonormal">BUT<o:p></o:p><=
/p>
                              </div>
                              <div>
                                <p class=3D"qt-msonormal">What if the DKI=
M
                                  signature includes the BIMI-selector
                                  header but doesn't pass validation AND
                                  DMARC still passes via SPF?<o:p></o:p><=
/p>
                              </div>
                              <div>
                                <p class=3D"qt-msonormal">It seems to me
                                  (given DKIM's normal use - a broken
                                  signature should be treated as not
                                  having a signature) that the receiver
                                  should treat the BIMI-selector header
                                  as unsigned and move on to
                                  default._bimi, but it's not actually
                                  stated one way or the other, so the
                                  response from the receiver could be to
                                  stop BIMI validation entirely.<o:p></o:=
p></p>
                              </div>
                              <div>
                                <p class=3D"qt-msonormal">=C2=A0<o:p></o:=
p></p>
                              </div>
                              <div>
                                <p class=3D"qt-msonormal">=C2=A0<o:p></o:=
p></p>
                              </div>
                              <div>
                                <div>
                                  <div>
                                    <p class=3D"qt-msonormal"><span
                                        class=3D"size"><b><span
                                            style=3D"font-size:7.5pt;font=
-family:&quot;Verdana&quot;,sans-serif">Zack
                                            Aab</span></b></span><span
                                        class=3D"size"><span
                                          style=3D"font-size:7.5pt;font-f=
amily:&quot;Verdana&quot;,sans-serif">
                                          (He/Him)</span></span><span
                                        style=3D"font-size:7.5pt;font-fam=
ily:&quot;Verdana&quot;,sans-serif"><br>
                                        <span
                                          class=3D"qt-gmail-m878107713538=
4541872size">Senior
                                          Consultant, Trendline
                                          Interactive</span><br>
                                        <span
                                          class=3D"qt-gmail-m878107713538=
4541872size"><b>O</b>
                                          <a href=3D"tel:+15127174097"
                                            target=3D"_blank"
                                            moz-do-not-send=3D"true">
                                            +1 (512) 717-4097</a> | <b>C<=
/b>
                                          <a href=3D"tel:+14043176729"
                                            target=3D"_blank"
                                            moz-do-not-send=3D"true">+1
                                            (404) 317-6729</a> |
                                          <b>W</b> <a
href=3D"https://urldefense.com/v3/__https:/www.trendlineinteractive.com/_=
_;!!CQl3mcHX2A!WQ-21HMjp9kg9GakwBT_pAPcHXM38K2yUd_r1iIZYfE97a34wAqfUMixJX=
uGcn3A2tiXW_Y$"
                                            target=3D"_blank"
                                            moz-do-not-send=3D"true">
                                            trendlinei.com</a></span></sp=
an><o:p></o:p></p>
                                  </div>
                                </div>
                              </div>
                            </div>
                          </blockquote>
                          <div>
                            <p class=3D"qt-msonormal">--=C2=A0<o:p></o:p>=
</p>
                          </div>
                          <div>
                            <p class=3D"qt-msonormal">bimi mailing list<o=
:p></o:p></p>
                          </div>
                          <div>
                            <p class=3D"qt-msonormal"><a
                                href=3D"mailto:bimi%40ietf.org"
                                target=3D"_blank" moz-do-not-send=3D"true=
">bimi@ietf.org</a><o:p></o:p></p>
                          </div>
                          <div>
                            <p class=3D"qt-msonormal"><a
href=3D"https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo/=
bimi__;!!CQl3mcHX2A!WQ-21HMjp9kg9GakwBT_pAPcHXM38K2yUd_r1iIZYfE97a34wAqfU=
MixJXuGcn3A3P4VcGQ$"
                                target=3D"_blank" moz-do-not-send=3D"true=
">https://www.ietf.org/mailman/listinfo/bimi</a><o:p></o:p></p>
                          </div>
                          <div>
                            <p class=3D"qt-msonormal">=C2=A0<o:p></o:p></=
p>
                          </div>
                        </blockquote>
                        <div>
                          <p class=3D"qt-msonormal">=C2=A0<o:p></o:p></p>=

                        </div>
                        <div
                          id=3D"qt-gmail-m_8781077135384541872sig63695113=
">
                          <div
                            id=3D"qt-gmail-m_8781077135384541872sig215033=
13">
                            <div>
                              <p class=3D"qt-msonormal">--<o:p></o:p></p>=

                            </div>
                            <div>
                              <table class=3D"MsoNormalTable"
                                cellspacing=3D"3" cellpadding=3D"0"
                                border=3D"0">
                                <tbody>
                                  <tr>
                                    <td style=3D"padding:.75pt .75pt .75p=
t
                                      .75pt">
                                      <p class=3D"qt-msonormal"><img
                                          style=3D"width:.4583in;height:.=
4583in"
                                          id=3D"_x0000_i1026"
src=3D"https://secure.gravatar.com/avatar/b214a020f4eb135ce2a6901d7540bdb=
1?s=3D44&amp;d=3D404"
                                          moz-do-not-send=3D"true"
                                          width=3D"44" height=3D"44"
                                          border=3D"0"><o:p></o:p></p>
                                    </td>
                                    <td style=3D"padding:.75pt .75pt .75p=
t
                                      .75pt">
                                      <div>
                                        <p class=3D"qt-msonormal">=C2=A0 =
Marc
                                          Bradshaw<o:p></o:p></p>
                                      </div>
                                      <div>
                                        <p class=3D"qt-msonormal">=C2=A0=C2=
=A0<a
href=3D"https://urldefense.com/v3/__http:/marcbradshaw.net/__;!!CQl3mcHX2=
A!WQ-21HMjp9kg9GakwBT_pAPcHXM38K2yUd_r1iIZYfE97a34wAqfUMixJXuGcn3Ajv1deoc=
$"
                                            target=3D"_blank"
                                            moz-do-not-send=3D"true">marc=
bradshaw.net</a>
                                          |=C2=A0<a
href=3D"https://urldefense.com/v3/__https:/twitter.com/marcbradshaw__;!!C=
Ql3mcHX2A!WQ-21HMjp9kg9GakwBT_pAPcHXM38K2yUd_r1iIZYfE97a34wAqfUMixJXuGcn3=
AYnziQXA$"
                                            target=3D"_blank"
                                            moz-do-not-send=3D"true">@mar=
cbradshaw</a><o:p></o:p></p>
                                      </div>
                                    </td>
                                  </tr>
                                </tbody>
                              </table>
                            </div>
                          </div>
                          <div>
                            <p class=3D"qt-msonormal">=C2=A0<o:p></o:p></=
p>
                          </div>
                        </div>
                        <div>
                          <p class=3D"qt-msonormal">=C2=A0<o:p></o:p></p>=

                        </div>
                      </div>
                    </div>
                  </div>
                  <div>
                    <p class=3D"MsoNormal">-- <o:p></o:p></p>
                  </div>
                  <div>
                    <p class=3D"MsoNormal">bimi mailing list<o:p></o:p></=
p>
                  </div>
                  <div>
                    <p class=3D"MsoNormal"><a href=3D"mailto:bimi@ietf.or=
g"
                        target=3D"_blank" moz-do-not-send=3D"true">bimi@i=
etf.org</a><o:p></o:p></p>
                  </div>
                  <div>
                    <p class=3D"MsoNormal"><a
href=3D"https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo/=
bimi__;!!CQl3mcHX2A!TfLCVUwlA6N-UmGBdsTK83EMJ7Y6e0vZDbakmAadQBUEukVeKNUlV=
Vb2aYdaT6t7tmtMhfg$"
                        target=3D"_blank" moz-do-not-send=3D"true">https:=
//www.ietf.org/mailman/listinfo/bimi</a><o:p></o:p></p>
                  </div>
                </blockquote>
              </div>
              <div>
                <p class=3D"MsoNormal">--=C2=A0<o:p></o:p></p>
              </div>
              <div>
                <p class=3D"MsoNormal">bimi mailing list<o:p></o:p></p>
              </div>
              <div>
                <p class=3D"MsoNormal"><a href=3D"mailto:bimi%40ietf.org"=

                    moz-do-not-send=3D"true">bimi@ietf.org</a><o:p></o:p>=
</p>
              </div>
              <div>
                <p class=3D"MsoNormal"><a
href=3D"https://urldefense.com/v3/__https:/www.ietf.org/mailman/listinfo/=
bimi__;!!CQl3mcHX2A!TfLCVUwlA6N-UmGBdsTK83EMJ7Y6e0vZDbakmAadQBUEukVeKNUlV=
Vb2aYdaT6t7tmtMhfg$"
                    moz-do-not-send=3D"true">https://www.ietf.org/mailman=
/listinfo/bimi</a><o:p></o:p></p>
              </div>
              <div>
                <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p>
              </div>
            </blockquote>
            <div>
              <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p>
            </div>
            <div id=3D"sig63695113">
              <div id=3D"sig21503313">
                <div>
                  <p class=3D"MsoNormal">--<o:p></o:p></p>
                </div>
                <div>
                  <table class=3D"MsoNormalTable" cellspacing=3D"3"
                    cellpadding=3D"0" border=3D"0">
                    <tbody>
                      <tr>
                        <td style=3D"padding:.75pt .75pt .75pt .75pt">
                          <p class=3D"MsoNormal"><img id=3D"_x0000_i1025"=

src=3D"https://secure.gravatar.com/avatar/b214a020f4eb135ce2a6901d7540bdb=
1?s=3D44&amp;d=3D404"
                              moz-do-not-send=3D"true" border=3D"0"><o:p>=
</o:p></p>
                        </td>
                        <td style=3D"padding:.75pt .75pt .75pt .75pt">
                          <div>
                            <p class=3D"MsoNormal">=C2=A0 Marc Bradshaw<o=
:p></o:p></p>
                          </div>
                          <div>
                            <p class=3D"MsoNormal">=C2=A0=C2=A0<a
href=3D"https://urldefense.com/v3/__http:/marcbradshaw.net/__;!!CQl3mcHX2=
A!TfLCVUwlA6N-UmGBdsTK83EMJ7Y6e0vZDbakmAadQBUEukVeKNUlVVb2aYdaT6t79NtKVsQ=
$"
                                moz-do-not-send=3D"true">marcbradshaw.net=
</a>
                              |=C2=A0<a
href=3D"https://urldefense.com/v3/__https:/twitter.com/marcbradshaw__;!!C=
Ql3mcHX2A!TfLCVUwlA6N-UmGBdsTK83EMJ7Y6e0vZDbakmAadQBUEukVeKNUlVVb2aYdaT6t=
7bCbWKL8$"
                                moz-do-not-send=3D"true">@marcbradshaw</a=
><o:p></o:p></p>
                          </div>
                        </td>
                      </tr>
                    </tbody>
                  </table>
                </div>
              </div>
              <div>
                <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p>
              </div>
            </div>
            <div>
              <p class=3D"MsoNormal"><o:p>=C2=A0</o:p></p>
            </div>
            <p class=3D"MsoNormal"><br>
              <br>
              <o:p></o:p></p>
          </blockquote>
        </div>
      </div>
    </blockquote>
  </body>
</html>

--------------C121A9047D60AF3120AAF305--


From nobody Tue Jun 29 06:34:20 2021
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