You don’t need a new system to do this and in fact can do it yourself. The issue comes in with signing up for new accounts, etc. Unfortunately there’s all sorts of different domains that emails can come from even with a single provider.
Relevant XKCD: xkcd.com/927/
Moonrise2473@feddit.it 1 day ago
I set the mail server to bounce everything that doesn’t match dkim.
I almost don’t receive spam anymore.
The problem is that sometimes some legitimate services didn’t configure their email server correctly
Object@sh.itjust.works 1 day ago
Wait, mail providers don’t block DKIM misconfiguration by default??
Moonrise2473@feddit.it 1 day ago
They’re mostly configured to ignore it, at most quarantine it