The mailing list for listmasters using Sympa

[Dave Page <address@concealed>]

Your proposal looks not unlike implementing Sender Rewriting Scheme, but 
including the list name.

Possibly it would be useful for Sympa to implement SRS instead as a way 
of mungeing From: lines which doesn't break DMARC?

https://en.wikipedia.org/wiki/Sender_Rewriting_Scheme

Cheers,
Dave

On 08/02/17 18:46, Adam Bernstein (via sympa-users Mailing List) wrote:
> Sympa team and others -
>
> We continue to run into trouble with DMARC-related issues, most 
> recently with delivery to Office 365 users: Microsoft is now requiring 
> alignment of DKIM signature and From: address, and since we can't 
> easily tell what domains are hosted there, we are forced to munge all 
> From: lines. (And they do this regardless of the sending domain's 
> DMARC policy or lack of policy, so we can't use that to control 
> behavior, argh.) But munging still brings up other issues.
>
> The biggest problem is that some email clients (eg. Apple Mail), at 
> least in some modes, will *not* reliably show you the actual From: 
> line that contains the sender's name like "Adam Bernstein <via 
> testlist>".
>
> Instead, if you have ever received from that email address before, 
> they remember the sender name from the *first* one ever received, and 
> will continue to show you only that name on all future messages - not 
> what is actually given as the current sender. So we can't force the 
> current sender name to be displayed in all cases, and that creates too 
> big a usability problem.
>
> To force all email clients to show the sender name on all list 
> messages, we would need the email address in From: to be unique for 
> each sender, even when munged. So, instead of:
>
>     From: Sender Name (via listname) <listname@listdomain>
>
> perhaps it could be more like the X-Envelope-From formatting, using a 
> + address extension to create a unique address for this sender:
>
>     From: Sender Name (via listname) <listname+sender=domain@listdomain>
>
> where the list address is listname@listdomain, and the original sender 
> address is sender@domain.
>
> That should work, yes? Does it bring up any technical issues I'm not 
> thinking of? Would Sympa consider that change?
>
> Thanks much for any input.
>
>      adam

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