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Fair call.

TBH, like most things, it's easy when you know what you are looking for. Most mail clients allow you to view the original message, headers and all. It's not an easy read, hence why...

Email headers will tell you everything you need, to determine if the email is legit or not.
If it's passed SPF, DKIM, DMARC, you can confidently assume it's coming from the domain it claims to be....