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So what, people should only be able to email you if you've previously emailed them?No, people should be able to email me as they would normally.
I should be able to block senders, or entire domains. To use a direct example: if I decide that substack is shit because they subscribe people without consent (which is exactly true), then I should be able to block all things from substack and not just a single email address from the domain.
If the spammer is operating within the continental US (or any other country with a reasonable court system), then the spammer should be legally and monetarily liable for the time and money wasted. Everything from the second it takes my server to receive the message, to the second it takes to transmit to my email client, to the multiple seconds it takes me to read the headline and/or body, and the time it takes to press the block button -- the energy costs, the hardware cost, the bandwidth cost, my own time's cost, and the cost of lost confidence in the safety of the internet (just as a thief in your home makes you lose confidence in the safety of your neighborhood) -- all of it should be legally and monetarily liable.
So when that shit substack email puts on a SendGrid or Mailchimp facade, or goes through some Cloudflare or CloudFront or whatever CDN, those "businesses" also get blocked and sued into oblivion because fuck any "business" that doesn't want to own the relationship with their customer, and fuck any "business" whose customer is not the person they're emailing.
So... you want to send me an email? Cool! I hope you will agree that it's legitimate *and wanted*. Because if it's not then I should be able to take you, or your business, to court for wasting my time (and time is money) -- and win on that ground alone.
tl;dr:
Why do I have such a stark view on this, many might ask?
Well let me put it simply: "legitimate" spam is indistinguishable from targeted phishing. So that "unsubscribe" link that people so proudly claim is a great solution? Clicking it does not improve the spam situation and does increase vulnerability to malicious actors. I'm not going to click on that because it doesn't go anywhere that I recognize and can verify. That "unsubscribe" link is worse than a real solution because it's only theatre.