why there is nothing like a “verified checkmark” for E-Mails of real companies like PayPal to distinguish their E-Mails from scams
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There is. It’s called Sender Policy Framework. It is a record in DNS (Domain Name Service, which translates something like gmail.com to IP addresses or other types) that ensures an email claiming to be from a specific domain name was sent by a mail server authorized in the DNS record. The problem is that some mail servers allow non authorized emails through because some mail server administrators are lazy and don’t establish SPF records. Personally, I require all emails to have. proper SPF record on servers I administrate. When people complain they aren’t receiving email from a specific company I send them info on how to set up SPF. I’m not confident we will achieve 100% coverage.
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