-all isn't necessarily a slam dunk because it interacts badly with lots of mailing lists. There is standards work underway to improve this, but it's still an is

-all isn't necessarily a slam dunk because it interacts badly with lots of mailing lists. There is standards work underway to improve this, but it's still an issue, for example https://www.ietf.org/mail-archive/web/ietf/current/msg87153.html https://www.ietf.org/mail-archive/web/ietf/current/msg87153....