>> The local signer here must know this message goes to [email protected] >> an add a signature including "!fs=ietg.org" > >An average email author cannot be relied on to cause this setting to be >made.
Quite correct. I would expect conditional signatures to be applied by large mail systems, using their private list of domains that look like mailing lists to decide who gets them. >From the past couple of years of discussion, it is clear that all of the large mail systems already have such a list of domains, so the implementation should be straightforward. Small domains may not, in which case there's a variety of ways they could approximate it, e.g., sniff incoming mail for stuff that looks like list mail to create a list, cooperate on a shared database of mailing list domains, or most likely admit that they are too small to be phish targets so publishing a DMARC policy is counterproductive. R's, John _______________________________________________ dmarc mailing list [email protected] https://www.ietf.org/mailman/listinfo/dmarc
