[ Today is not my day for getting details right. Sigh. ]
On 12/28/2017 11:57 AM, Jordan Brown wrote:
> I've been running my mailing list for a few years with "Munge From" to
> defend against DMARC rejection. This means that my messages get
>
> From: Joe User <mymailingl...@mydomain.com>
That should be
From: Joe User via MyMailingList <mymailingl...@mydomain.com>
> Reply-To: Joe User <j...@example.com>
>
> That mostly works, but sometimes confuses people a bit, and just now
> I've had somebody send what I think was intended as a private address to
Should be "... intended as a private message to ..."
> that From line, not to the Reply-To line. (I think their e-mail client,
> Pegasus, has an excessively flexible policy on which headers to use for
> a reply and may be subtly misconfigured, but maybe they just naively
> copied the From line.)
>
> That's leading me to wonder whether there's another way, whether I can
> leave From alone and still get past the DMARC checks. Wikipedia tells
> me that DMARC passes if either SPF *or* DKIM passes. There's no hope
> for SPF with the original sender in From, because the mailing list
> server isn't the user's mail server. However, DKIM seems like it
> *might* pass, if I'm careful in how I configure the mailing list. In
> particular, it looks like I'd have to get rid of the message footer.
> That would be OK. Looks like I might also have to kill off the
> [ListName] addition to the Subject, which is less OK but might be better
> than the alternative.
>
> Before I go recruit a couple of users from several DMARC-using providers
> and run some tests, can anybody tell me if there is any hope there, and
> maybe share some configuration tips?
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