The mailing list for listmasters using Sympa

[Adam Bernstein <address@concealed>]

Sympa team, sorry to duplicate, but any input on this? We need a way to 
work around the caching of senders' full names in some mail clients if 
we're going to be able to use Sympa's From: address munging to avoid 
DMARC and DMARC-like (Office 365) issues.

Thanks much.

    adam

On 2/8/2017 10:46 AM, Adam Bernstein 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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