Carsten Bormann wrote: > John R Levine <johnl@xxxxxxxxx> wrote: >> >> You can complain about how stupid they are or you can upgrade >> your mail system to use authentication methods that have been >> IETF standards for a decade and get your mail delivered. Your choice. > > The most likely outcome is that local admins will "upgrade" our mail system > by turning off IPv6. (We have had IPv6 deployed for some 18 years now.) turning off IPv6 is a surprisingly (depressingly?) successful mitigation for a number of networking problems... -Martin