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Google now blocks spoofed emails for better phishing protection
(www.bleepingcomputer.com)
This is a most excellent place for technology news and articles.
It was a work issue about a decade ago. Client wanted certain emails from automation to be masked as coming from him.
Most email boxes, including Gmail, didn't have an issue. Outlook(the one that shipped with Office) laughed at it and displayed the original sender in giant bold letters.