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From: Brandon Long <blong@google.com>
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Subject: Re: [dmarc-ietf] I-D Action: draft-ietf-dmarc-interoperability-13.txt
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The current draft seems complete to me.

Brandon

On Tue, Dec 8, 2015 at 3:56 PM, <internet-drafts@ietf.org> wrote:

>
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
>  This draft is a work item of the Domain-based Message Authentication,
> Reporting & Conformance Working Group of the IETF.
>
>         Title           : Interoperability Issues Between DMARC and
> Indirect Email Flows
>         Authors         : Franck Martin
>                           Eliot Lear
>                           Tim Draegen
>                           Elizabeth Zwicky
>                           Kurt Andersen
>         Filename        : draft-ietf-dmarc-interoperability-13.txt
>         Pages           : 23
>         Date            : 2015-12-08
>
> Abstract:
>    DMARC introduces a mechanism for expressing domain-level policies and
>    preferences for email message validation, disposition, and reporting.
>    The DMARC mechanism can encounter interoperability issues when
>    messages do not flow directly from the author's administrative domain
>    to the final recipients.  Collectively these email flows are referred
>    to as indirect email flows.  This document describes interoperability
>    issues between DMARC and indirect email flows.  Possible methods for
>    addressing interoperability issues are presented.
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-dmarc-interoperability/
>
> There's also a htmlized version available at:
> https://tools.ietf.org/html/draft-ietf-dmarc-interoperability-13
>
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-dmarc-interoperability-13
>
>
> Please note that it may take a couple of minutes from the time of
> submission
> until the htmlized version and diff are available at tools.ietf.org.
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
> _______________________________________________
> dmarc mailing list
> dmarc@ietf.org
> https://www.ietf.org/mailman/listinfo/dmarc
>

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<div dir=3D"ltr">The current draft seems complete to me.<div><br></div><div=
>Brandon</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quot=
e">On Tue, Dec 8, 2015 at 3:56 PM,  <span dir=3D"ltr">&lt;<a href=3D"mailto=
:internet-drafts@ietf.org" target=3D"_blank">internet-drafts@ietf.org</a>&g=
t;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0=
 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.<br>
=C2=A0This draft is a work item of the Domain-based Message Authentication,=
 Reporting &amp; Conformance Working Group of the IETF.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Title=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:=
 Interoperability Issues Between DMARC and Indirect Email Flows<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Authors=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: Fran=
ck Martin<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Eliot Lear<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Tim Draegen<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Elizabeth Zwicky<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Kurt Andersen<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Filename=C2=A0 =C2=A0 =C2=A0 =C2=A0 : draft-iet=
f-dmarc-interoperability-13.txt<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pages=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:=
 23<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Date=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 :=
 2015-12-08<br>
<br>
Abstract:<br>
=C2=A0 =C2=A0DMARC introduces a mechanism for expressing domain-level polic=
ies and<br>
=C2=A0 =C2=A0preferences for email message validation, disposition, and rep=
orting.<br>
=C2=A0 =C2=A0The DMARC mechanism can encounter interoperability issues when=
<br>
=C2=A0 =C2=A0messages do not flow directly from the author&#39;s administra=
tive domain<br>
=C2=A0 =C2=A0to the final recipients.=C2=A0 Collectively these email flows =
are referred<br>
=C2=A0 =C2=A0to as indirect email flows.=C2=A0 This document describes inte=
roperability<br>
=C2=A0 =C2=A0issues between DMARC and indirect email flows.=C2=A0 Possible =
methods for<br>
=C2=A0 =C2=A0addressing interoperability issues are presented.<br>
<br>
<br>
The IETF datatracker status page for this draft is:<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-dmarc-interoperabili=
ty/" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/doc/=
draft-ietf-dmarc-interoperability/</a><br>
<br>
There&#39;s also a htmlized version available at:<br>
<a href=3D"https://tools.ietf.org/html/draft-ietf-dmarc-interoperability-13=
" rel=3D"noreferrer" target=3D"_blank">https://tools.ietf.org/html/draft-ie=
tf-dmarc-interoperability-13</a><br>
<br>
A diff from the previous version is available at:<br>
<a href=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-dmarc-interoperab=
ility-13" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/rfcdiff=
?url2=3Ddraft-ietf-dmarc-interoperability-13</a><br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n<br>
until the htmlized version and diff are available at <a href=3D"http://tool=
s.ietf.org" rel=3D"noreferrer" target=3D"_blank">tools.ietf.org</a>.<br>
<br>
Internet-Drafts are also available by anonymous FTP at:<br>
<a href=3D"ftp://ftp.ietf.org/internet-drafts/" rel=3D"noreferrer" target=
=3D"_blank">ftp://ftp.ietf.org/internet-drafts/</a><br>
<br>
_______________________________________________<br>
dmarc mailing list<br>
<a href=3D"mailto:dmarc@ietf.org">dmarc@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/dmarc" rel=3D"noreferrer" =
target=3D"_blank">https://www.ietf.org/mailman/listinfo/dmarc</a><br>
</blockquote></div><br></div>

--001a1135e238a6f1490528883e46--


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Subject: [dmarc-ietf] Clarification question on handling multiple domains in RFC5322.from (section 6.6.1)
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While revising the interop document, I am adding a note about the situation
with multiple domains in a syntactically correct RFC5322.from header
(section 6.6.1). The last paragraph of that section reads:
>
> The case of a syntactically valid multi-valued RFC5322.From field presents
> a particular challenge. The process in this case is to apply the DMARC
> check using each of those domains found in the RFC5322.From field as the
> Author Domain and apply the most strict policy selected among the checks
> that fail.


I realize that an earlier statement in the section defines the actual
handling to be implementation dependent, but it's not clear to me how the
advice in the last paragraph would really be applied.

Say for example that a message is received with two domains in the
RFC5322.from: test1.example and test2.example. If test1.example fails to
have an aligned, authenticated identifier but specifies p=reject while
test2.example *does* have an aligned, authenticated identifier, then it
seems to me that the message receives a DMARC pass evaluation and the
policy for test1.example is irrelevant since p=reject doesn't apply to a
message that passes DMARC.

Am I misunderstanding the recommended algorithm?

--Kurt Andersen

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<div dir=3D"ltr">While revising the interop document, I am adding a note ab=
out the situation with multiple domains in a syntactically correct RFC5322.=
from header (section 6.6.1). The last paragraph of that section reads:<bloc=
kquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left-=
width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;paddin=
g-left:1ex">The case of a syntactically valid multi-valued RFC5322.From fie=
ld
   presents a particular challenge.  The process in this case is to
   apply the DMARC check using each of those domains found in the
   RFC5322.From field as the Author Domain and apply the most strict
   policy selected among the checks that fail.</blockquote><div><br></div><=
div>I realize that an earlier statement in the section defines the actual h=
andling to be implementation dependent, but it&#39;s not clear to me how th=
e advice in the last paragraph would really be applied.</div><div><br></div=
><div>Say for example that a message is received with two domains in the RF=
C5322.from: test1.example and test2.example. If test1.example fails to have=
 an aligned, authenticated identifier but specifies p=3Dreject while test2.=
example *does* have an aligned, authenticated identifier, then it seems to =
me that the message receives a DMARC pass evaluation and the policy for tes=
t1.example is irrelevant since p=3Dreject doesn&#39;t apply to a message th=
at passes DMARC.</div><div><br></div><div>Am I misunderstanding the recomme=
nded algorithm?</div><div><br></div><div>--Kurt Andersen=C2=A0</div></div>

--001a11470ed2dff73d05299f6060--


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Subject: Re: [dmarc-ietf] Clarification question on handling multiple domains in RFC5322.from (section 6.6.1)
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> On Jan 18, 2016, at 12:49 PM, Kurt Andersen (b) <kboth@drkurt.com> =
wrote:
>=20
> Am I misunderstanding the recommended algorithm?
>=20

Maybe the example of @crime.net <http://crime.net/> and @bank.com =
<http://bank.com/> might add clarity.  If both have a p=3Dreject policy, =
and only @crime.net <http://crime.net/> successfully passes the DMARC =
check, it would be wise to enforce @bank.com's reject policy, no?

=3D- Tim


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
Jan 18, 2016, at 12:49 PM, Kurt Andersen (b) &lt;<a =
href=3D"mailto:kboth@drkurt.com" class=3D"">kboth@drkurt.com</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
style=3D"font-family: Thonburi; font-size: 12px; font-style: normal; =
font-variant: normal; font-weight: normal; letter-spacing: normal; =
line-height: normal; orphans: auto; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; widows: auto; word-spacing: =
0px; -webkit-text-stroke-width: 0px;" class=3D"">Am I misunderstanding =
the recommended algorithm?</div><br =
class=3D"Apple-interchange-newline"></div></blockquote></div><br =
class=3D""><div class=3D"">Maybe the example of @<a =
href=3D"http://crime.net" class=3D"">crime.net</a>&nbsp;and @<a =
href=3D"http://bank.com" class=3D"">bank.com</a>&nbsp;might add clarity. =
&nbsp;If both have a p=3Dreject policy, and only @<a =
href=3D"http://crime.net" class=3D"">crime.net</a>&nbsp;successfully =
passes the DMARC check, it would be wise to enforce @<a =
href=3D"http://bank.com" class=3D"">bank.com</a>'s reject policy, =
no?</div><div class=3D""><br class=3D""></div><div class=3D"">=3D- =
Tim</div><div class=3D""><br class=3D""></div></body></html>=

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Subject: [dmarc-ietf] New Version Notification for draft-ietf-dmarc-interoperability-14
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A new version of I-D, draft-ietf-dmarc-interoperability-14.txt has been
successfully submitted by Kurt Andersen and posted to the IETF repository.

This version incorporates all of the comments that have been received
during last call; particularly those from Steven Turnbull (clarifying some
of the wording in section 2.1) and Eliot Lear (adding Appendix A to help
explain the issue with bounce message handling).

Please let me know if my interpretations of the feedback diverge from the
intended comments and questions.

--Kurt

Name:           draft-ietf-dmarc-interoperability
Revision:       14
Title:          Interoperability Issues Between DMARC and Indirect Email
Flows
Document date:  2016-01-18
Group:          dmarc
Pages:          25
URL:
https://www.ietf.org/internet-drafts/draft-ietf-dmarc-interoperability-14.txt
Status:
https://datatracker.ietf.org/doc/draft-ietf-dmarc-interoperability/
Htmlized:
https://tools.ietf.org/html/draft-ietf-dmarc-interoperability-14
Diff:
https://www.ietf.org/rfcdiff?url2=draft-ietf-dmarc-interoperability-14

--001a113a5fba836a2c0529a1388c
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<div dir=3D"ltr">A new version of I-D, draft-ietf-dmarc-interoperability-14=
.txt=C2=A0has been successfully submitted by Kurt Andersen and posted to th=
e=C2=A0IETF repository.<div><br></div><div>This version incorporates all of=
 the comments that have been received during last call; particularly those =
from Steven Turnbull (clarifying some of the wording in section 2.1) and El=
iot Lear (adding Appendix A to help explain the issue with bounce message h=
andling).</div><div><br></div><div>Please let me know if my interpretations=
 of the feedback diverge from the intended comments and questions.</div><di=
v><br></div><div>--Kurt<br><br><font face=3D"monospace, monospace">Name: =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 draft-ietf-dmarc-interoperability<br>Rev=
ision: =C2=A0 =C2=A0 =C2=A0 14<br>Title: =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
Interoperability Issues Between DMARC and Indirect Email Flows<br>Document =
date: =C2=A02016-01-18<br>Group: =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0dmarc<br=
>Pages: =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A025<br>URL: =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0<a href=3D"https://www.ietf.org/internet-drafts/draft-i=
etf-dmarc-interoperability-14.txt">https://www.ietf.org/internet-drafts/dra=
ft-ietf-dmarc-interoperability-14.txt</a><br>Status: =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 <a href=3D"https://datatracker.ietf.org/doc/draft-ietf-dmarc-interop=
erability/">https://datatracker.ietf.org/doc/draft-ietf-dmarc-interoperabil=
ity/</a><br>Htmlized: =C2=A0 =C2=A0 =C2=A0 <a href=3D"https://tools.ietf.or=
g/html/draft-ietf-dmarc-interoperability-14">https://tools.ietf.org/html/dr=
aft-ietf-dmarc-interoperability-14</a><br>Diff: =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 <a href=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-dmarc-int=
eroperability-14">https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-dmarc-inte=
roperability-14</a></font></div></div>

--001a113a5fba836a2c0529a1388c--


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From: Franck Martin <franck@peachymango.org>
To: Tim Draegen <tim@eudaemon.net>
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Thread-Topic: Clarification question on handling multiple domains in RFC5322.from (section 6.6.1)
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Archived-At: <http://mailarchive.ietf.org/arch/msg/dmarc/huu0sWANZAnRHnbx9PQ7oSxSyzM>
Cc: dmarc@ietf.org, "Kurt Andersen \(b\)" <kboth@drkurt.com>
Subject: Re: [dmarc-ietf] Clarification question on handling multiple domains in RFC5322.from (section 6.6.1)
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Yes, you look at all the DMARC policies you can find, select the ones with the most strict policy reject>quarantine>none and if any reject policy gets a dmarc fails you reject the email... You err in the side of caution rather than permission. 

----- Original Message -----

From: "Tim Draegen" <tim@eudaemon.net> 
To: "Kurt Andersen (b)" <kboth@drkurt.com> 
Cc: dmarc@ietf.org 
Sent: Monday, January 18, 2016 10:02:50 AM 
Subject: Re: [dmarc-ietf] Clarification question on handling multiple domains in RFC5322.from (section 6.6.1) 




On Jan 18, 2016, at 12:49 PM, Kurt Andersen (b) < kboth@drkurt.com > wrote: 

Am I misunderstanding the recommended algorithm? 





Maybe the example of @ crime.net and @ bank.com might add clarity. If both have a p=reject policy, and only @ crime.net successfully passes the DMARC check, it would be wise to enforce @ bank.com 's reject policy, no? 

=- Tim 


_______________________________________________ 
dmarc mailing list 
dmarc@ietf.org 
https://www.ietf.org/mailman/listinfo/dmarc 


------=_Part_21994_197732168.1453241219729
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<html><body><div style=3D"font-family: arial,helvetica,sans-serif; font-siz=
e: 12pt; color: #000000"><div><span style=3D"color: #222222; font-family: a=
rial, sans-serif; font-size: small; font-style: normal; font-variant: norma=
l; font-weight: normal; letter-spacing: normal; line-height: normal; orphan=
s: auto; text-align: start; text-indent: 0px; text-transform: none; white-s=
pace: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px;=
 display: inline !important; float: none; background-color: #ffffff;" data-=
mce-style=3D"color: #222222; font-family: arial, sans-serif; font-size: sma=
ll; font-style: normal; font-variant: normal; font-weight: normal; letter-s=
pacing: normal; line-height: normal; orphans: auto; text-align: start; text=
-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-sp=
acing: 0px; -webkit-text-stroke-width: 0px; display: inline !important; flo=
at: none; background-color: #ffffff;">Yes, you look at all the DMARC polici=
es you can find, select the ones with the most strict policy reject&gt;quar=
antine&gt;none and if any reject policy gets a dmarc fails you reject the e=
mail... You err in the side of caution rather than permission.</span><br></=
div><div><br></div><hr id=3D"zwchr"><div style=3D"color:#000;font-weight:no=
rmal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,san=
s-serif;font-size:12pt;" data-mce-style=3D"color: #000; font-weight: normal=
; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,s=
ans-serif; font-size: 12pt;"><b>From: </b>"Tim Draegen" &lt;tim@eudaemon.ne=
t&gt;<br><b>To: </b>"Kurt Andersen (b)" &lt;kboth@drkurt.com&gt;<br><b>Cc: =
</b>dmarc@ietf.org<br><b>Sent: </b>Monday, January 18, 2016 10:02:50 AM<br>=
<b>Subject: </b>Re: [dmarc-ietf] Clarification question on handling multipl=
e domains in RFC5322.from (section 6.6.1)<br><div><br></div><div><blockquot=
e class=3D""><div class=3D"">On Jan 18, 2016, at 12:49 PM, Kurt Andersen (b=
) &lt;<a href=3D"mailto:kboth@drkurt.com" class=3D"" target=3D"_blank" data=
-mce-href=3D"mailto:kboth@drkurt.com">kboth@drkurt.com</a>&gt; wrote:</div>=
<br class=3D"Apple-interchange-newline"><div class=3D""><div style=3D"font-=
family: Thonburi; font-size: 12px; font-style: normal; font-variant: normal=
; font-weight: normal; letter-spacing: normal; line-height: normal; orphans=
: auto; text-align: start; text-indent: 0px; text-transform: none; white-sp=
ace: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0p=
x;" class=3D"" data-mce-style=3D"font-family: Thonburi; font-size: 12px; fo=
nt-style: normal; font-variant: normal; font-weight: normal; letter-spacing=
: normal; line-height: normal; orphans: auto; text-align: start; text-inden=
t: 0px; text-transform: none; white-space: normal; widows: auto; word-spaci=
ng: 0px; -webkit-text-stroke-width: 0px;">Am I misunderstanding the recomme=
nded algorithm?</div><br class=3D"Apple-interchange-newline"></div></blockq=
uote></div><br class=3D""><div class=3D"">Maybe the example of @<a href=3D"=
http://crime.net" class=3D"" target=3D"_blank" data-mce-href=3D"http://crim=
e.net">crime.net</a>&nbsp;and @<a href=3D"http://bank.com" class=3D"" targe=
t=3D"_blank" data-mce-href=3D"http://bank.com">bank.com</a>&nbsp;might add =
clarity. &nbsp;If both have a p=3Dreject policy, and only @<a href=3D"http:=
//crime.net" class=3D"" target=3D"_blank" data-mce-href=3D"http://crime.net=
">crime.net</a>&nbsp;successfully passes the DMARC check, it would be wise =
to enforce @<a href=3D"http://bank.com" class=3D"" target=3D"_blank" data-m=
ce-href=3D"http://bank.com">bank.com</a>'s reject policy, no?</div><div cla=
ss=3D""><br class=3D""></div><div class=3D"">=3D- Tim</div><div class=3D"">=
<br class=3D""></div><br>_______________________________________________<br=
>dmarc mailing list<br>dmarc@ietf.org<br>https://www.ietf.org/mailman/listi=
nfo/dmarc<br></div><div><br></div></div></body></html>
------=_Part_21994_197732168.1453241219729--


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Subject: [dmarc-ietf] I-D Action: draft-ietf-dmarc-interoperability-14.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Domain-based Message Authentication, Reporting & Conformance Working Group of the IETF.

        Title           : Interoperability Issues Between DMARC and Indirect Email Flows
        Authors         : Franck Martin
                          Eliot Lear
                          Tim Draegen
                          Elizabeth Zwicky
                          Kurt Andersen
	Filename        : draft-ietf-dmarc-interoperability-14.txt
	Pages           : 25
	Date            : 2016-01-18

Abstract:
   DMARC introduces a mechanism for expressing domain-level policies and
   preferences for email message validation, disposition, and reporting.
   The DMARC mechanism can encounter interoperability issues when
   messages do not flow directly from the author's administrative domain
   to the final recipients.  Collectively these email flows are referred
   to as indirect email flows.  This document describes interoperability
   issues between DMARC and indirect email flows.  Possible methods for
   addressing interoperability issues are presented.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-dmarc-interoperability/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-dmarc-interoperability-14

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-dmarc-interoperability-14


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

