> On 1 Mar 2017, at 20:34, David Morris <dwm@xxxxxxxxx> wrote: > > > > On Wed, 1 Mar 2017, Carsten Bormann wrote: > >> On 1 Mar 2017, at 20:18, Michael StJohns <mstjohns@xxxxxxxxxxx> wrote: >>> >>> eventually customize the confirm message based on provider >> >> Better: Send the subscription confirmation message with attributes that cause a DMARC-honoring provider to discard it :-) >> (No programming required :-) > > No, that is worse as it insures support costs and more noise on this list. I apologize for trying to inject some humor into this serious matter. Silently dropping subscription requests isn’t very nice. So there probably should be a second (DMARC-unencumbered) message telling people to expect the confirmation request message and to use a different mail system if it does not arrive. I do not agree that actively preventing DMARC-honoring addresses from subscribing would be worse than the current situation, where the subscriber thinks they are on, only to be kicked off after a short while (or, worse, simply not receiving some of the messages). Grüße, Carsten