On May 9, 2015 1:09:09 PM EDT, "Stephen J. Turnbull" <[email protected]> wrote: >Scott Kitterman writes: > > > How many solutions do you think operators will be willing to > > implement? > >As many as have an expected benefit/cost ratio greater than 1, of >course. > >If you want numbers, my expectation is about 0.5 (the odds are >perceptibly better than even that *nothing* will be done), but I would >hardly be surprised by 2 or more, since it seems likely that mailing >lists and 3rd-party originated messages will require different >solutions, and I think the operators would like to implement given a >favorable benefit-cost ratio.
0.5 is about my estimate too. > > As I indicated in my utility assessment framework, I think we get a > > maximum of one solution that requires cooperative implementations > > in multiple parts of the originator/mediator/receiver trilogy. > >Hm. That's strange. They've already implemented SMTP, SPF, DKIM, and >DMARC. By my count, that puts them a minimum of three solutions past >what what you expect. I meant how many solutions to the DMARC mediated sender problem. Yahoo, for example, already consider the impact of this and other breakage to be less than the benefit of p=reject. I expect their willingness to invest engineering resources in further reducing a level of breakage they've already determined is acceptable will be limited. > > Given that, it had better be reasonably comprehensive. > >I expect that levine-dkim-conditional + "register addresses found in >List-Post as candidates for delegation when an authenticated user >posts" is as cheap as it's going to get, and will cover more than half >of mailing lists. I think that's pretty comprehensive for a start, >and thus something worth thinking about and looking for improvements, >rather than rejecting because it won't eliminate world poverty in 30 >days. I think that's at least one more than gets implemented. Scott K _______________________________________________ dmarc mailing list [email protected] https://www.ietf.org/mailman/listinfo/dmarc
