The mailing list for listmasters using Sympa

[Miles Fidelman <address@concealed>]

Just took a look at List.pm for Sympa 6.1.20 -- looks like there are 
some significant differences in header munging from 6.1.19 - might want 
to be careful.

I think I'll try upgrading to 6.1.19 and apply the patch there.

Miles Fidelman

Steve Shipway wrote:
> I attach (yet another) patch for Sympa 6.1.19 for your consideration 
> that addresses the recent Yahoo DMARC issues.  This modifies the 
> List.pm file to munge the From header in certain circumstances as 
> discussed in this list last week.  It should work against most 6.1.x 
> branch versions; I’ve not tried it with 6.2.x.
>
> The patch adds a new configuration option set under the DKIM group, 
> called ‘DMARC Protection’.  This has three configurable parameters;  a 
> Mode, a Domain regexp; and an email address.
>
> The Protection Mode allows you to select which emails are to be 
> munged.  You can select all, none, by domain regexp, and/or ‘auto’.  
> ‘Auto’ is any message with an existing DKIM signature in the header.  
> This allows you to specify that only @yahoo.com emails are munged, or 
> these plus any pre-signed message, and so on.
>
> The Domain regexp allows you to match against the email From address.
>
> The New Address allows you to specify the address used for the 
> replacement.  This is very much like normal anonymisation and defaults 
> to the list address.
>
> When activated, the code will replace the From header with  ‘“original 
> sender (original email)” <new email>’ so that the remote DKIM checks 
> do not fail.  It will also strip any DKIM-Signature header (moving it 
> to X-Original-DKIM-Signature), set up a Reply-To header with the 
> original >From address (though this may later be replaced according to 
> your Reply-to list settings), and add an X-Original-From header.
>
> This works independently of any list anonymisation, so you can have 
> both at once (though it would be a bit pointless).  I felt it better 
> to separate this into a new stanza so as not to affect any existing 
> anonymisation options.  Possibly another option could be added to the 
> same group to give choices on how the new From header phrase is 
> constructed; however I didn’t have time for this.
>
> I have tested this in both domain and auto modes, from local and from 
> Yahoo.com and can confirm that it works as expected and allows 
> Yahoo.com people to use a list without changing the experience of 
> non-yahoo people (if run in Domain mode against yahoo.com only).
>
> In light of the recent Yahoo.com situation, possibly the Sympa team 
> would like to consider adding this functionality to the next release?
>
> All comments and feedback welcome
>
> Steve
>
> *Steve Shipway*
>
> University of Auckland
>
> /UNIX Systems Design Team Lead/
>
> address@concealed
>
> +64 (9) 3737 599 ext 86487


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In theory, there is no difference between theory and practice.
In practice, there is.   .... Yogi Berra