On Jan 24, 2014, at 11:35 AM, Steve Atkins <[email protected]> wrote:

> On Jan 24, 2014, at 11:07 AM, Franck Martin <[email protected]> wrote:
> 
>> 
>> On Jan 24, 2014, at 9:50 AM, John R Levine <[email protected]> wrote:
>> 
>>>> I agree that something like this should be added but would suggest that it 
>>>> needs to be a little more nuanced seeing as there are lists which are 
>>>> DMARC aware and send mail in such a way as to not cause rejects.
>>> 
>>> Do you have some examples?  I've never seen one.
>>> 
>> 
>> All the apache.org mailing lists are fine as for one example.
>> 
>> http://www.apache.org/foundation/mailinglists.html
> 
> What is it about the apache lists that makes them DMARC aware? They don’t 
> seem to rewrite the 5322 From: address, and they do appear to rewrite the 
> Subject line (presumably breaking DKIM signatures). I’d expect that to 
> provoke DMARC rejections, if any typical user were to interact with the list 
> from a domain that used DMARC.
> 
> (Random example mail: 
> http://mail-archives.apache.org/mod_mbox/httpd-users/201401.mbox/raw/%[email protected]%3e
>  )

Most Apache lists aren't DMARC aware, they're DMARC agnostic. Most of the 
Apache lists use Ezmlm, same as I do. I read somewhere that Apache doesn't 
append body trailers, which would leave only the Subject prefixing lists with 
any issue DMARC related issues, and then only from domains that sign the 
Subject header.

For those sender domains with mailing list users, they could just drop Subject 
from the list of fields they sign. I'm not sure if anyone does that. On my 
lists, I just dropped the subject prefixes.

Matt
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