DMARC, DKIM and SPF filtering
These days, spam and phishing emails mostly come from hijacked or AI-registered fake email addresses, and blocking the email address does nothing to block the spammer. If you could block emails based the displayname not matching the valid email server of the domain the email claims to be from, you would block a LOT more spam and phishing emails, saving your customers and your own company a lot of problems. This can be implemented easily with DMARC, DKIM and even just SPF filtering. All corporate email systems do this by default. Outlook does this by default. Yahoo mail can too.
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Scott Q
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