If that email is actually from Logitech, it probably has some way to unsubscribe. Might have added you for some nonsense reason like a warranty registration, but I’ve never hit problems with a reputable company not providing a way to unsubscribe.
The random scam stuff…yeah, probably can’t do much about that.
One possibility I’ve wondered about is whether, someday, email shifts to a whitelist-based system. I mean, historically we’ve always let people be contacted as long as they know someone’s physical address or phone number or email address, and so databases of those have value – they become keys to reach people. But we could simply have some sort of easy way to authorize people and block everyone else. In a highly-connected world, that might be a more reasonable way to do things.
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
Wait, mail providers don’t block misconfigured DKIM by default??
They’re mostly configured to ignore it, at most quarantine it
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: https://xkcd.com/927/
