On Wed, Dec 21, 2016 at 01:10:16PM +0100, Philip Homburg wrote: > >The focus has been on Yahoo because of a message which was posted > >several years ago. I collected some statistics for an IETF mailing > >list. Approximately 40% of the subscribers are using [1] DMARC; most > >of then are not using Yahoo. > > Are you talking about senders or recipients? The reason yahoo stands out is > because yahoo seems to be one of the few providers that rejects or bounces > mail that fails DMARC checks. > > Or are you saying that at the moment 40% of the subscribers of IETF lists reject > or otherwise not receive mail from DMARC protected senders? It's much more likely that this is the percentage of subscribers that are sending from domains that are claiming a DMARc policy. What's interesting is how few of these domains are actually *following* the DMARC specification in rejecting, unconditionally, e-mails which fail the DMARC checks. Which to me shows how defective by design DMARC really is; even many of the proponents of DMARC are running mail systems which are not honoring the DMARC "specification". Given that the DMARC "specifcation" isn't even being treated as a standard that must be obeyed in all of its particulars by its proponents --- the fact that this is being used by its propoonents to twist mailers of the IETF --- a standards body --- into knots because it is enforcement is random and *not* standardized is, quite frankly, amazing to me. Let the employees of those companies which are proponents of DMARC suffer. And they might not be suffering that much given that at least one of those companies isn't really enforcing DMARC on the receiving end for their users.... - Ted