Say I want to setup a forwarding service working reliably even for emails from senders using SPF. How would I proceed?

Is ARC a silver bullet, or is it not sufficiently broadly implemented yet? What are your solutions to this problem?

Googling a bit does not give me a clear idea of the state of things, for example when comparing:

* https://stackoverflow.com/questions/37133200/is-dmarc-the-end-of-email-forwarding

* http://arc-spec.org/

* https://service.uoregon.edu/TDClient/2030/Portal/KB/ArticleDet?ID=94882

* https://en.wikipedia.org/wiki/DMARC#Forwarders

Thanks!